Single-family house, approx. 140 m², 2 children's rooms - What do you think of the floor plan?

Mostly yes, but there are also answers that try to "push" their own taste

I think most people here do limit themselves to pointing out problems in everyday life. Common planning mistakes like closets that are too narrow or lack of wardrobe space, utility rooms that are too small, or a pantry in the south - things like that. If someone now says they want their living room in the north because they hate the sun - everyone grumbles at first, but ultimately it is accepted if there is a clear reason given by the original poster.

It is not functional at all - that annoys me too

You don't have to be annoyed about that. You pointed it out, which is correct, but he has said more than once that he wants it that way, so it just is that way.