Floor plan EHF, can it be implemented like this?

I would plan a bit more space for the stairs, gallery, and entrance/wardrobe. Right now, you walk directly into a wall upstairs, and as already mentioned, there is hardly any space for a wardrobe downstairs. A 14 sqm bathroom is quite spacious. In the WC on the ground floor, I would include a shower. I might make the bedroom a bit larger. 24 sqm is already quite large for a children's room. The question is whether a small child would feel comfortable there at all (of course, for teenagers, it can never be big enough). Is that a carport on the right? If so, considering the absence of a basement, I would rather plan a garage with a storage room. Otherwise, it is a fairly typical, efficient floor plan layout, except for the enclosed storage room. What one makes of a cook-living room is up to each individual. With the floor area, I would have planned a separate kitchen with a double or sliding door to the living room.

Stair example: And this is already calculated with a fairly small tread width.

I think the floor plan is great, and I find it very sensible that the children's room is the largest. I have it like that for my children as well. We parents really only use our bedroom for sleeping, and during the day we are either out at work or spend time in the living room, but the children spend most of their time in their rooms – playing, doing homework, meeting friends... The living-dining room in your plan is of course a bit small, so I understand why you are opening the kitchen there. You can achieve a visual separation through a bar or kitchen island (e.g. with an attached dining table), or even use a half wall extending into the room with storage space. It wouldn’t be load-bearing anyway, so you can still decide on that once the rest is done. The space for the stairs is sufficient with a not too high ceiling height, but of course it would be more comfortable if you planned a bit more space (at least 4m length). If you go left to the stairs immediately from the house entrance, you could extend them to the back (then part of the living room would be underneath). The space under the stairs is sufficient for a wardrobe area; you can put a custom-fit shoe rack in the lower part and hang jackets where there is more headroom.