Floor plan design for a 135 sqm single-family house - ideas and advice wanted

That the floor plan does not please us at all so far surprises us a little.

This is primarily not about the "not liking it," but about the "not working."
Guest as a later bedroom with double bed and wardrobe does not work.
I repeat: Furniture + dimensions.

That the floor plan doesn't please at all so far,

... I did not say that. I only don't see the groundbreaking clever difference to the 08/15 model without the addition "Individual Edition" or I suspect that where one sees such a difference, the "Classic" version would be better.

Downstairs is not a cloakroom, but a guest room for the family etc.

Yes it is. Where there is no cloakroom space, entrance-near "guest" rooms (also called "study" rooms, the principle remains the same) become de facto coat pile rooms.

We wanted to show you the layout of the rooms and see if they are sensibly arranged?

The layout could be correct from the location perspective. But there is a difference between a "sketch of where rooms are supposed to be" and a good or bad design.
Here, I would rather place the utility room accessible to the access road, otherwise the piping route becomes too long. Then you should consider whether you want to give the children the garden side, or/and the west side, or if they should sleep facing the street.
I consider a 3-meter built-in wardrobe in the bedroom obligatory. A hallway upstairs where you can move around brings more spaciousness than an extra square meter in the rooms ever would.
The hallway on the ground floor feels cramped.
The kitchen could probably be nicely furnished, but the central door situated like a portal leading to the utility room does not make sense to me. Only the already mentioned path, always through the kitchen and virtually the living room to get the ladder or cleaning supplies would annoy me. An open kitchen is inherently part of the living area, not the utility space.
Storage room in the south… also unclear.

In my opinion, outsourcing a shower that is unnecessary in the guest toilet and making it accessible from the cloakroom is more a shot in the foot than a great idea.

Full agreement!

The separate small toilet serves exclusively for guests who come over for barbecues, etc.

That is clear…

Downstairs there is no cloakroom but a guest room for the family, etc. We thought it would be a nice idea if they had their own shower bathroom.

… however, you cannot afford this “luxury” on 135 sqm. While you need sufficient cloakroom space daily for all family members, you rather plan a “luxury room” with a private bathroom that is used only sporadically.
That is rather o_O (I am at a loss for words, the emoticon says it better)

Later in age, when we no longer want to climb stairs, our idea was to use this as a bedroom.

Later in age, you will rather curse both toilet units downstairs because they are practically unusable, too small; the guest room is also poorly furnished due to the bunch of doors.

The idea with the pre-installed kitchen pipes came from our family circle, as it is paying off for them now. The children have their own domain upstairs with their own kitchen. That’s why we included this idea.

But that won’t work for you: downstairs there is no adequate residential unit possible.

Later in life, you will rather curse both toilet units down there, because they are practically not walkable

I agree with that (among many other points). A bathroom does not necessarily have to be disabled-accessible for old age, but it should be age-appropriate. And that requires a space demand that does not fit the house. Plan a nice house for the next 30-35 years. And then see what happens then.

Read again in the original thread:

Overnight guests per year: unk

If the number of overnight guests is unclear, then a shower hardly makes sense, at least not directly as a "guest bathroom".
It will probably be more like the home office, let's not kid ourselves.
Especially since the idea of an "own bathroom" with "prospective 2 children" is more in the very distant future. And as already written: the room is not furnitureable as a bedroom…

Conservative or modern construction: modern

I see less modern here. Everything would have to be a bit more open and flooded with light.

Now the question arises whether we have to redesign the floor plan, since among other things in the attic we would also be looking out of the windows on the right eaves side into their property / house.

With a KS of 1 meter and double casement windows there is no "looking at the neighbor".

Read again in the opening thread:

If the overnight guests are already unclear, then a shower hardly makes sense, at least not directly as a "guest bathroom".
It will probably be more like the home office, let's be honest.
Especially since the idea of "own bathroom" with "prospective 2 children" is rather in the very distant future. And as already mentioned: the room is not furnishable as a bedroom...

I see it as less modern here. Everything would have to be somewhat more open and filled with light.

With a knee wall of 1 meter and double casement windows there is no "view of the neighbor".

Hello,
Thank you for your answers.
We accept the opinions and will remove the additional WC and move the guest shower bathroom to the utility room side, so that the guest room has a reasonable size. However, we plan the walk-in shower here.

The utility room would be exactly on the side where the access would also take place. So this is already the shortest way.

The storage room would be in the west and not in the south. Therefore, that should be fine?

We find the route from the utility room to the kitchen more sensible than from the utility room to the hallway (because of groceries from the carport or the possibility of using some kind of pantry). But maybe we will still find a way for the utility room to open to the hallway, with direct access to the kitchen. That would then be the architect's task.

Knee wall 1m and double casement windows: on the eaves side we would have windows that face the neighbor side. Thus, we would indeed be able to look out onto the neighbors and their garden or watch them if there is a barbecue party there (exaggerated expression).