Single-family house cube without roof with full floor

Didn't get it. Do you mean everything in a line, so to speak?
Kitchen on the left, dining in the middle, and living on the right?
And the stairs stay where they are?
What did you mean last time by tilting 90 degrees?

Do you mean something like this?

Take a look at pictures of Fingerhaus Neo Hannover.
The gallery is gone and the upper floor is relatively closed off.

Very open entrance area, stairs, dining, kitchen.
I found it something you have to get used to, but often family life takes place at the dining table. The living room was somewhat subdued, neither open nor closed.

Maybe something like this?

Something like that... There should still be room for a wardrobe. The staircase can also be spiral at the top, so the hallway doesn’t become terribly large. Close off the living room further.

Fingerhaus Neo would be something like that as well...

I’m already racking my brains about how to separate the stupid staircase from the living area without ending up with a tiny living area.

You don’t have to suffer alone, start a thread about it and get some help.

Do you think I could solve the problem if I take the concrete staircase and close it off completely? Would that change anything about the noise level?
I also had the option with the concrete staircase and doing everything with a wall still open.

Frankly, that wouldn’t be the only thing I would change. Overall, your design – like many modern amateur designs – seems strongly inspired by sitcom studios. Whether you can quiet such a combination of city villa and loft with just curtains, I have serious doubts.

Hmm.. I might also do it downstairs with carpenter’s cabinets so as not to lose space.

I see storage, but nothing that would help the acoustics (?)

My kids have a big fleet of vehicles ))

Yeah, with the Porsche 911 I had to look twice to see that it’s probably a kid’s car *grin*

Boa haydee I really like that! I'll mix something together. Let's see if something good 'comes out of it.