Floor plan optimization single-family house on a slope, single-story + basement

Hello dear ones,
we would greatly appreciate your opinions on our floor plan. In principle, we are very satisfied with the floor plan. Nevertheless, we are interested in your opinions on the living floor. Specifically, the area with the master bedroom, children's room, and the bathroom. For example, in the bathroom there is still no place to hang your once-worn clothes or a laundry basket.

Bebauungsplan/Einschränkungen
Size of the plot: 2262 sqm
Slope: yes
Site occupancy index: 0.4
Floor space index: 0.8
Building window, building line and boundary: see pictures
Number of parking spaces: 4 (double garage, 2 on the street)
Number of floors: 2-2.5 (basement, ground floor, attic)
Roof shape: staggered monopitch roofs (15° and 18°)
Orientation: northeast/southwest
Further requirements: no development plan, slope going uphill from the street side

Requirements from the builders
Style, roof shape, building type: relatively modern, staggered monopitch roof, single-family house
Basement, floors: 1 full floor + "half" basement (half into the slope)
Number of people, age: 2 (27+33) possibly 2 children planned
Room requirements on ground floor, upper floor:
Storage space we have in the basement and in the attic. In the basement there is the technical room, a workshop, and a granny flat. On the upper floor we have an open living area, a guest bathroom, a bathroom, 2 offices/children’s rooms and the master bedroom. Above the hallway and the "kitchen" the attic is planned.
Office:
Currently, 2 offices/children’s rooms are planned. Since we don’t yet know whether we want children, we do not want to plan an additional office. If we do need another office later, the granny flat will be used or a “hut” will be built in the garden.
Number of overnight guests per year: 15 (granny flat)
Open or closed architecture: rather open. Living room, dining room and guest area go up to the ceiling. Above the hallway and kitchen is the attic.
Conservative or modern construction: rather modern
Open kitchen, cooking island: open kitchen with peninsula
Number of dining places: 6-8 permanently
Fireplace: Swedish stove
Music/stereo wall: doesn’t matter
Balcony, roof terrace: no
Garage, carport: double garage
Other wishes: We definitely wanted a large workshop to accommodate all the existing equipment. Also, a double garage was desired.

House design
Who created the plan: architect
What we like especially: living on one floor
What we don't like: the bathroom, because there is no possibility to put down clothes or for a laundry basket. The "dressing room" (which is actually the hallway).
Cost estimate according to architect/planner: 650,000 (including outdoor facilities, kitchen, bathroom, ancillary building costs)
Personal budget limit for the house, including equipment: 720,000 (all furniture is present except for bathroom and kitchen)
Preferred heating technology: air heat pump

If you have to do without,
which details/extensions can you do without: apart from the bidet in the bathroom, we can’t think of anything else (originally 2 more rooms were planned)
which you cannot do without: basement, workshop

Why did the design turn out as it is now?
The plot is relatively steep. The driveway goes uphill from the street (see pictures). The house is set back to the rear because the slope directly at the street has the steepest incline and there is a “shadow hole” there.
Originally, a single-family house with basement + 2 floors and double garage was planned. Then our architect had the idea that living space could be placed above the double garage. As a result, the 2nd full floor was eliminated. Also, we liked the idea of being able to live on one floor in old age (then with stairlift).

Many thanks in advance for your ideas

Add more height specifications. Why do you call a floor "ground floor" when its floor is above the eaves of the neighbors? My reading tip is: by

Hello 11ant,
what exactly do you mean by OG and EG? Basically, we have a basement, ground floor, and attic.
The floor is above the eaves of the right neighbor but at the same level as the residential building of the left neighbor (the building on the left that is so close to our property is a barn).
Attached is a picture of the cross-section.
Regarding the height information: Do you mean the one from the slope?
The street is at about 678m elevation.
The basement is currently at about 681.5m and the ground floor at 684.5m.

We are satisfied with the position of the house, and it is mainly about the room layout on the ground floor.

How does the building envelope progress?
What is the purpose of this mini granny flat?
Why are you blocking windows with the garage?

How does the building window run?
What is the purpose of this mini granny flat?
Why are you blocking windows with the garage?

What is marked as the rounding boundary is the end of the building plot. Otherwise, we just have to keep the boundaries to the neighbor. But as I said, we are satisfied with the position of the house. We are only concerned with the arrangement of the bathroom, children's room, and master bedroom.

We do not want to rent out the granny flat. We have different possibilities for how we want to use the granny flat and the size is sufficient for that.

Which windows are blocked by the garage?
The garage borders the hallway in the basement and the workshop, which has windows on the side.

This is not a garage wall in front of the window, but the end of a foundation wall at ground level. The garage is a parking space. I like the design. A household of 3 people with a good relationship with the child, especially through the teenage years... A shared dressing room is a clever idea. Later, when the child has visitors, the guest room can become the children's living room. I wouldn’t like guests walking through my dressing room so much. Still: Be confident, this might be just right for you! For people who don’t accumulate much and want to manage the house easily. Terrace promises a holiday feeling – depending on the view. Nice and coherent project.