This is the bedroom upstairs, I modified it.
And this is the top view of the second floor:
I did not like very much the handrails of the stair because they are not following the handrails that I put on the second floor, but I think there is no way to eliminate this imperfection, or is it? Maybe someone already encountered a similar problem. Maybe I should look for a 3d model of stairs that has shorter handrails or I should use one without handrails (but I think it is not the best solution).