Room interior wall not built straight

But after acceptance? Well.

Even if it were before acceptance, in my opinion there would only be one option to correct completed interior construction: straighten by applying a new layer of plaster, which means loss of surface area in both rooms.
Otherwise, there remains a recognition bonus of 100€ or a “sue me,” because it’s peanuts.

The only sensible time to complain about a crooked wall is during the shell construction. A laser distance meter is the builder’s best friend.

imho only one option for correction: straighten by repainting,

Not serious at ten centimeters.

At ten centimeters no way.

Oops, overlooked.
Then I guess it stays that way.

Then I guess it will stay that way.

Why not, considering

Can someone tell me what would be appropriate compensation here.

I also have the impression that the OP's interest is more in compensation for pain and suffering than in healing :-(

It's just stupid when you want to put something right-angled into the corner. A 2-meter bed then stands about 6 cm away from the wall. And that affects two rooms.

Which bed do you put in the corner?

Which bed do you put in the corner?

It is not uncommon in children's rooms.