So I don't like the floor plan. For example, I would expect the staircase on the northeast side facing the street, so that the office can be on the garden side to the southeast. This would also allow mirroring upstairs and moving the master bedroom to the quiet garden side instead of the street.
I would allow the master bedroom 3 sqm more and take 3 sqm away from one child. That would at least be fair. For parents, 14 sqm including the wardrobe is really tight. Of course, a different layout would be necessary to achieve this distribution of space. The door to the small bathroom next to the head of the bed and the toilet flush directly on the partition wall mean that you can’t use this bathroom without disturbing someone in bed. I would probably make the small bathroom accessible from the hallway so anyone can use it as a guest bathroom when the family bathroom is occupied. Toilet, washbasin and shower fitting then on the exterior wall.
Especially on the ground floor, I find the hallways oversized as well. In my opinion, that’s wasted space. A toilet does not need 4.5 sqm without a shower, half of that would be enough. I would put the pantry in the basement and only have a large storage cabinet in the kitchen. You have a better chance for the food to stay cool in the basement than on the southeast side next to the kitchen. Also, you have plenty of space in the basement that you lack in the living-dining-kitchen area. This is all quite tight compared to the house size. Best to place the pantry right under the stairs in the basement, that way you have the shortest distance from the front door when you come home with groceries.
Cold air does not rise and living basements aren’t really cold either. Therefore, a windbreaker is actually no longer necessary these days. Cold air has never come up from my basement anyway ;)
I find the exterior quite boring because all windows are neatly aligned. I would glass in the dining area much more generously, possibly even around the corner. I don’t like a sofa in front of the window either, I would rather place the TV under the window or in the corner or on the northwest wall and enjoy the view outside. In other words, sofa on the office wall.
Terrace roof: I would use glass including shading options or a retractable louvered roof. However, that does not work with the extra strip on the southeast side. What is that for?
What I like: Separate cloakroom, platform staircase.