Floor plan optimization city villa + fill consideration

I actually want all showers to be directed against a wall for splash protection reasons, because I don't want to use glass doors. He did it wrong in the children's bathroom.

I would forgo the children's bathroom. Instead, I would prefer to plan a spacious bathroom that is enjoyable to enter every time. The second shower would then be for guests and as an alternative on the ground floor. You can spend the money better elsewhere, and you have to clean everything anyway. Then you might also have an additional small room upstairs as a storage room or similar.

The shower bath downstairs is not suitable for seniors with limited mobility (and if you can no longer walk the stairs, then you are that) How do you want to separate the living room?

I find 3 bathrooms too many. Especially since, except for the children's rooms, there is a lack of space everywhere. Definitely provide the children's rooms with a window on the other house wall. Especially in summer, if one window is shaded, the other can be opened and brings light

Why is the shower bath not suitable for seniors with limited mobility? Just put up a wall on the left in the living room when you come in.

Ok, the thing about the windows in summer is an argument. I still don't know how big I should make all the windows. Someone here once wrote that we should make all the windows 1 meter wide. Isn't that too big for the utility room, downstairs bathroom, and dressing room?

Door opens to the left in the living room because we don't want any wall on the right side (see post #1) and therefore the door can't hit anything on the right. He simply took this piece of wall from your design. What advantage does this piece of wall have? Or is it a matter of taste?

The piece serves exactly for the door stop, and it is also a small visual barrier against the kitchen, plus you can nicely fit a kitchen shelf into the corner (e.g., with cookbooks or spices).

3. Shower is correct. So that we can still live there when we are old.

If there is no bedroom or guest room downstairs, I think that's nonsense. But if it's that important to you, okay. I would consider the floor space for the wardrobe more important. You won't use the shower for 40 years now. By the time you need it, you'll have to renovate the bathroom anyway. Then it's better to move the wall later and install the shower. Unless a big dog moves in that needs to be showered regularly there.

Wall in front of the stairs: oh God, does that go up to the ceiling???
I imagine a parapet wall made of masonry about 1m high or however high they usually are. Isn't that a parapet? How high should it be?

That is not apparent from the drawing. Usually, a half-height wall is either shown with a different color, only dashed lines, or it is indicated directly. If it's supposed to be half-height, then it's fine.

I'll better ask again about the half-height wall.

The other two points make me think. Thanks! Especially that the shower can be retrofitted easily. Can the retrofit always be done, or do we need to say during the planning about the connections that it must be prepared so that it can be retrofitted later? I don’t know much about this.

So that we can still live there in old age.

There are stairlifts too! I never understand why many builders plan to live only on the ground floor in old age, which still has to be rebuilt for that purpose anyway. When the time comes that I definitely can’t go up the stairs anymore, what am I supposed to do with the house? At least that’s how I see it...