Floor plan single-family house city villa approx. 200m² - Bavaria

I would leave out the children's bathroom. You still have the bathroom on the ground floor as an alternative. As already mentioned, use bathroom 3 more as a utility room. I find the hallway on the ground floor and upper floor very large. On the ground floor, the hallway could perhaps be shortened and the wall aligned with the wall between the study and the living room. And on the upper floor, I would make the hallway much smaller. That's all unused space. Make the two children's rooms next to each other and a bit larger, i.e. add the space from bathroom 3 to the children's rooms. And then put the utility room basically into the hallway directly adjacent to or partly over the stairs. Then you simply won't have any natural light in the hallway. Either you put, for example, a glass door into the utility room so that some light comes into the hallway, or you just turn on the hallway light if it's too dark for you. You don't usually stay there but only walk through to reach the rooms.

Personal price limit for the house, including equipment:

What is your budget?

May I point to this question? How high is the budget just for the house?

Slope of the terrain: What restrictions result from this?
Direct transition from garage to the residential building sensible? Easily feasible?
Flat transition from terrace to garden possible?

Please ask your planner that.

Less space on the 1st floor

If you need less space on the upper floor, then the house should be planned accordingly and not just bluntly two-story.

where the exterior dimensions certainly will not be correct due to the uniformly very low wall thickness in this floor plan program;

You can edit that accordingly in this design program. (just go to edit)

2.51 m floor height in the new building? I would build 20 cm more, especially with such large open spaces, to avoid the parking deck look.

… by the way, the staircase is (kommentarlos) 3.30 long.

I could imagine that the all-purpose room is quite dark; in any case, it only gets very limited sunlight.

Based on the pictures, an evaluation is hardly possible…
First of all: always dimension properly, furnish, and indicate the orientation N/S/E/W.
The "laminate" is more of a disturbance than a help. Omit it.
What can be seen…
- way too much hallway/traffic space overall
- wardrobe at the stairs?
- passage to dining area permanently open or where does the sliding door slide to?
- stove is positioned somewhat unfavorably
- dining area directly in front of the hallway… generally unfavorable… space between dining/kitchen remains unused… table shifting/extension collides with kitchen seating
- in my opinion, the upper floor does not need to be addressed yet…

Therefore: create a wish list, go to the architect (he has to deal with the terrain anyway), and present the first draft here.