Floor plan design for a single-family house, approximately 9x11 meters, 2 full floors + attic

I wouldn't know what the TE's living room has to do with your preferences?

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Quite simply so that he thinks about how he wants it, what preferences he has?
It's not just your opinion...

So, we have thrown a lot overboard and have come to this result.
Bring on your opinions!

PS: Please no comments about our drawing skills

Desk by the parents' bed? Or makeup table?

Have you thought carefully that if the one on the right is supposed to be a wardrobe, you have to get up at the same time?

No, that is not a dressing table for the woman. The actual office is in the attic.

Always bring on your opinions!

In terms of drainage, I see a deterioration compared to the original draft.

No, this is not a dressing table for the woman. The actual office is in the attic.

So that means: applying makeup is office work and takes place in the attic? - aha

I would swap the locations of the dressing room and bathroom on the upper floor as it is now. Bathrooms/toilets should be stacked for short pipeline runs. Then I would possibly place both children’s rooms on the south side. With two bathrooms, a parent wing is recommended.