210 sqm single-family house - requesting suggestions for optimization

Unfortunately, I don’t quite follow this thought!? :)

The marked wall is meant. It is not clear from the draft how it is executed. I would only make it at parapet height, because of the light. Or even just as a railing for even more light. :)

You could also leave a corner flush with the bedroom and then start the railing, or go all around the corner at half height... Or, or, or..

I see the chimney flue! If the chimney is placed there, this wall is in the way. Therefore, leave it out! What purpose should this wall serve? At best, it is disruptive...

Parapet. A window with a parapet is not a floor-to-ceiling window. Parapets provide protection in every respect in bedrooms and bathrooms.

And please do not write inside the quotations. We also make an effort so that you can read.

Have you read the questionnaire? Because if grandma is supposed to move in as well, I don’t think the design is successful ;)

I am still a bit torn. This could mainly be because I can't quite handle the sloping roof in the upper floor. Where exactly in the rooms does a proper ceiling height start?
-> how easily accessible is the WC in the master bathroom?
I also can't quite imagine the shower in the middle of the room yet.

Is there any (possibly technical) reason why the children's rooms are not the same size?

Have you ever thought about separating the hallway to the master suite from the rest with a door?

On the ground floor, you are planning floor-to-ceiling windows in the kitchen, right? Will the space in the kitchen cabinets as drawn be enough for you?
In the living room, I think the couch will be placed against the wall to the office. Where will a TV, bookshelf, or similar be placed then? Don't get me wrong, I like many of the ideas, but I am wondering about the practicality, especially with many floor-to-ceiling windows.

Maria is right: with a ceiling height of 1 meter, the access to the toilet under the slant is below 2 meters

The wardrobe would just be enough for me as an individual [emoji23]
Unfortunately, a wardrobe only holds a few clothes at the moment. I don't see storage space for dozens of shoes. And the utility room can't be used for everything [emoji848]

Maria is right: with a knee wall of 1 meter, the access to the toilet under the slope is under 2 meters

I have to be honest, this sketching program with suggested lines isn’t really my thing. I just discovered the toilets now at all. What was the architect thinking? What’s also not so nice, I find, is the dark dressing room.

The staircase on the ground floor could be "illuminated" with light slits or some kind of interior window. Otherwise, it would be quite dark.