ᐅ Floor Plan Design for a Narrow Plot

Hello,

after reading for a while, I would like to present the current status of our plans.
The plot is inherited, near Vienna in Austria, with very good transport connections. The final decision to build there is not yet made, about 90% certain.
The existing building will be demolished. Further use is impossible.

In the plan, which is oriented to north:
red: the plot, access via green path, the house would currently be at the blue position. Existing building in yellow as garage and cellar replacement.
On the western boundary of the plot, there is a neighboring building, tall agricultural storage halls.
Two full floors possible.
"Closed building style" is a must, meaning at least one side must be attached to a neighboring building, on the other side at least a wall/gate or similar.
The plot is at its narrowest point, at the very north, exactly 12m (39 feet) wide. A drive-through possibility would be nice (also because of the existing garage), therefore a maximum house width of 9m (30 feet).

Size of the plot: 630m² (6781 ft²)
Slope: none, only very slight inclination

No basement, an additional garage is available/planned, see the yellow marking on the plan.
Two floors, high knee wall.
Currently 2 adults, 34 and 35 years old. 1-2 children planned.
Desired rooms:

Wishlist:
Living room / dining / kitchen, with fireplace
Pantry / storage room
WC + shower
Entrance area/wardrobe
Utility/technical room
Access to the terrace
Bedroom + walk-in closet
1 child’s bedroom
Office for home office use
Bathroom, separate WC
Storage/laundry room
Access to balcony

Guests are rather rare, a pull-out sofa in the office is sufficient.
Style: classic-modern, pitched roof
Definitely an open kitchen, an island would be nice, seating for 6 at the table, with option for more.
“Normal” living room wall with TV, nothing special.
Size: 140-170m² (1507-1830 ft²)

Current house design:
From the planner of a timber construction company
We are actually quite satisfied with it, this is the 3rd iteration... The entrance area/wardrobe might need some fine tuning. One child’s bedroom would be used as an office.
About 155m² (1668 ft²) of living space.

Budget for the house: 400,000, turnkey.
Heating: heat pump.

If you had to compromise on details/extras:
- What you could give up: The upper floor is still quite flexible, walk-in closet or similar is not a must. A covered parking space for the car was not a requirement but turned out to be included.
- What you cannot give up: open living space with terrace.

Open questions: General comments are welcome. Opinions on the room layout?
But also completely different approaches for this rather narrow plot would be interesting.

Plot:

Thank you very much for your support! :-)