180 sqm non-replacement house, best adaptation to the plot?

Sorry, attached again with north arrow. Why is the parking space so far back? Without a real reason, and not sensible, except that more width is available there than directly next to the house. The only planning requirement is no parking space IN FRONT of the house within the 7.5m area.

Thanks. Is there no requirement for 2 parking spaces with you?

No, it no longer exists in Berlin.

First, I would rotate the house slightly. This will make it 35 cm wider. Then place the barn 6 m from the right GG (in case you need space to park 2 cars. Normally, the car is left in the driveway after 7.5 m. Or the entrance on the side?

I would omit the balcony on the driveway side.

There is also a better place for the stairs.

Otherwise, I don’t want to get into the floor plans. For example, I would provide a room on the ground floor (guest room/bedroom).

By the way, I don't understand the twisting of one wall. You do have the south there, but the huge fir tree from the neighbor is standing there.

You do have the south there, but there stands the huge fir tree from the neighbor.

No, the fir tree stands in the northwest.

First, I would rotate the house a bit.

Absolutely right, that's what I had always told her, but she insisted on having the house parallel to the street instead of parallel to the property boundaries.

Then set the barn 6 m from the right property boundary (that way you can possibly park 2 cars there).

Yes, that's conceivable for us, on the other hand, it makes the south garden correspondingly narrower, and 6 m is not really spacious for two cars. One car might possibly stay on the street...

I would leave out the balcony on the driveway side.

Yes, no added value.

Quarter-turned staircase on the outer wall so the attic can be reached as well.

YES! This “storage air space” is not so valuable. It widens your dining area.

The room program was 4 bedrooms on the 1st/2nd floor, steam sauna somewhere. Living and dining area visually connected.

For example, I would provide a room on the ground floor (guest room / bedroom)

That would work without problems if we decide on a basement (omitting the utility room). We are currently commissioning a soil surveyor...

Question:
how do you see the facade...?