Thank you very much for the answers and your time!
I will pick out a few points:
1. I still notice the staircase ... --> The staircase was planned and drawn with 304 x 225 cm (according to the introduction thread).
2. Garage with 6 m external dimension and 2 cars, it will be difficult to reach the storage space behind the garage, e.g., for bicycles, etc. --> Since we live very close to the city and have short commuting distances, it will probably remain most of our lives with one car (+ motorcycle + bikes + Bobby car + scooter + etc.). That means the room in the south is exclusively storage space without vehicles.
3. The hallway on the ground floor really costs a lot of space, then also the passage to the garage. + Ground floor hallway 10-12 sqm, yours over 20 sqm --> That was also too big and not directly desired by us so far. However, if you reduce the hallway size, other rooms immediately lose space. Maybe I can reduce something in the east-west width, I will try again.
4. Parents’ area 15-20 sqm, yours 27 sqm + Sorry, but just look at the dressing room. You don’t have to say that this is intended. --> We would also have assigned ourselves less space. However, if you absolutely want this overhang (in a reasonable length so that a table can be placed under it), then the parent wing results accordingly.
5. What room height do you have in mind? --> Clear raw construction height is specified in "my" specification sheet as approx. 2.70 m
6. The design is full of empty space and large filler rooms that occur when one does not master Tetris. --> This presumably has more to do with the fact that I do not plan houses full-time and therefore have not yet developed a feeling for the relationship between plan size and real room size. However, I do not recognize empty space/filler rooms in the described extent.
7. And then I would be interested in a front view. That looks pretty jagged. + I also find the superstructure somewhat bulky and not appealing. --> Is that a matter of taste or a neutral assessment? From our private circle, we have some builders who cannot come to terms at all with a flat-roof house (or Bauhaus style). They typically have a square-practical-gabled roof. But I can’t base my subjective impression on that.