Suggestions for the floor plan of a single-family house about 175 sqm, gable roof house

I’ll try to address everything now...

The bathroom is amazing and the hallway also feels oversized. The office, on the other hand, is quite narrow. That would be okay as an office, but as a concert hall for the piano? Is the son or daughter only supposed to practice there, or is it meant for playing music together?
Unfortunately, the living room feels a bit uncomfortable because it becomes a pass-through room. The utility room would be too small for me without a laundry room upstairs. The second door takes up a lot of space and in my opinion makes little sense.
If it were mine, with this house size, I’d have a pantry and a laundry room and would rather have less dance floor space in the bathroom and hallway. More function and less "wow".

The bathroom ended up so big because I was worried it would be too cramped with a free-standing tub. The bathroom furniture isn’t fixed yet – I’d actually like the tub in front of a T-wall, no idea if that works... The hallway was also a concern that it would be too tight with 4 people. It’s never easy to judge. The office stays just an office, the piano ended up there by mistake, it’s actually meant for the living room. Do you mean the second door in the utility room is the one to the garage? We don’t uuuunquestionably need that. In principle, I would actually like pantry and laundry separate on the ground floor (at least if the size stays as it is), but that sounds a bit like a whole new plan...

What I really don’t like is the master bedroom. The bed seems to want to hide in front of all those windows. And the left side of the bed has two doors right within reach.

One thought was not to have a door to the dressing room, but leave an open connection. Or would you omit windows?

What are you doing with the big hallway? I find it a bit too big... and also too bad, to have an open staircase but hardly see anything of it when living. It’s basically like a hall... almost a bit uncomfortable :(
Overall the design might work, I’d also move the doors in the utility room, but you also have to say the master bedroom somehow seems unplanned, and because of the stair position the hallway gets these noses left and right from the gallery...

That’s because of the staircase position across. I like that, but what really bothers me here is the furnishing of the living room (2 opposite two-seaters and turning your head to the TV???) and yes: the feeling of sitting in the living room between two exits. Then the kitchen, which is hard to furnish (unless you love a U-shape with dance floor in the middle)... so the hallway and kitchen could be dance floors and the living room not for TV watching, the seating window not for sitting with a view, and I’d be out – out of the house and into the recycling bin.

We didn’t want to see the stairs from the living room so that the future friends of our children wouldn’t see us slouching on the couch in the evenings :) That’s why they ended up in the hallway. Or would you have a good idea regarding that? The furnishing in the living room is not liked as it is either. We considered removing the middle window and instead putting the TV on the outside wall and the couch opposite on the stair wall or vice versa. Do you think that would be a solution or would the living room then be too dark?
If I understand you correctly, you think very little could be saved with this floor plan in your eyes? Would there maybe be approaches to optimize a few things even if not all?

I have to leave some praise. You see a lot of floor plans on the construction forum, and I find this one very successful and appealing at first glance.

What might be unnecessary frills for some is perhaps the highlight for you that makes the house something special and hopefully something you will enjoy for many years. I wouldn’t give up the large bathroom if you value it and like to bathe/spend time there. What constitutes an appropriate bathroom size is very dependent on the person.

What I would reconsider: the bed niches in the children's rooms—will you still be able to furnish the rooms satisfactorily when the children are at an age where they want a wider bed? Presumably, these niches would have to be used for wardrobes then?

The office is relatively small. It depends on how frequently you want to use it and whether that bothers you. With a piano, I find it a bit cramped. The utility room with 10m² can work—we had the same in our first house—but since you don’t have another room for laundry, quite a bit will have to fit in there. Cleaning supplies and equipment, along with the building services and everything needed for washing. If you tend towards a photovoltaic system, maybe a home battery or something like that someday, I would consider whether part of that can be sensibly accommodated in the garage storage room and what needs to be prepared for that.

One sees many floor plans in the construction forum, and I find this one very successful and appealing at first glance.

That's exactly how I felt too. Successful at first glance... then you take another look, sleep on it, look at it two more times... and then somehow it's no longer good at all. What feels a bit like wishful thinking to me is the generous staircase and the minimal wall placement on the ground floor. Basically, a true pleasure for me. But it also blinds you.

For that, put the TV on the exterior wall and the couch opposite on the staircase wall or vice versa.

The problem (for me) would be that the entrance to the living room, the door on the left and from the kitchen right of the sofa would not be visible. That is not the cozy cave effect. If that doesn't bother someone or they are totally insensitive to the spatial effect, it might not matter to them. For me, it's almost a no-go. Just like the sofa the other way around. Then you are sitting with your back to the garden and cannot see it from the sofa.

If I understand you correctly, there would be little chance of rescue with this floor plan in your eyes?

Let's see. Usually a small change leads to many steps of changes...

Would there maybe be approaches to optimize a few things, even if not everything?

... and then you can just start over. You don't have much to lose if you deal with reorganizing the rooms. May I ask if the double garage with the storage room is included in the price?

We considered leaving out the middle window and instead placing the TV on the exterior wall and the couch opposite on the stair wall or vice versa.

We moved the windows/doors so that the TV is on the exterior wall, which had two advantages for us, when the TV is off, a nice view from the couch into the garden, when the TV is on, no window causes glare. We also made the bathroom that big, especially for the sauna.

I would carefully plan the staircase, because if something doesn’t fit there, it will ruin the entire floor plan. I roughly extracted the measurements in relation to the length of the house and calculated them. At about 37 degrees, it will be quite steep due to its short length. The headroom will be very tight, right at the limit.

I agree with .. at least the overlap is quite large and could lead to head clearance issues, especially for taller people when going down the stairs. Here's an example picture, only 2 steps overlapped, in your representation it is even 2.5 steps.