Floor plan of a city villa with approximately 160 m² without basement

...I think that leaves too little width for the living room. I think it should be at least 4m.

It is even 4.20m. Attached are some measurements, if you're interested. I see the problem much more that the utility room is too small with 7m² and the pantry is still missing. But there are surely more ideas. Unfortunately, the time issue is really a big one.

Thanks again for your efforts. So, if I increase the dimensions back to 10x10.50, I think it would probably work very well at first glance. But then it’s just a cube with a different layout. But maybe the layout is better, I will definitely test that out. As I said, the straight staircase is not a must. Utility room with 7 is too small, but if you move everything up a bit, it might work. I just need to compare the overall room dimensions.

It's really a lot of fun here in the forum, discussing and exchanging ideas with you. Even though I previously thought our plan was almost perfect

Well, simply smoothing it out is not always a good solution. I'm afraid the house will lose more than it gains. After all, the staircase is a landing staircase, albeit a narrow one. Maybe we'll look further instead.

You write that it is after all a staircase with a landing. What is the big advantage here, besides being more space-saving than a straight staircase? I think a straight staircase will require the most space. We planned it because we wanted to make a pantry underneath. Maybe a 1/4 turn staircase would be better and more space-saving. Or then the 1/2 turn with landing??

Most people plan the space-saving version with the beveled steps for a 1/2 winding staircase, as it naturally requires the least space. A landing has the advantage that you have consistently straight, rectangular steps and, in my opinion, it also looks a bit more elegant. However, it requires corresponding depth. Here it is 2.85m at the top on one side and 2.60m on the other side. Also rather tight - but that depends on the floor height, which I do not know.