Newly built single-family house approx. 220 sqm, 2nd design city villa

I don't find 20sqm too big for a children's room. Children also have much more furniture than parents in the master bedroom. I think they deserve to have a sofa with a reclining section or a bigger bed in there. Then a large wardrobe possibly, a bookshelf, desk... I always had about 20sqm and found it good. Not too big. I also liked coming back to the house during semester break.

Help me out with the views. Is Ansicht Süd the south side or the view facing south?

If it's the south side, why are you putting the entrance there and not on the east next to the garage?
Can you share a picture of the property, or link to the first thread again?

The terrace is in the north, entrance in the south

We were planning to equip the sleeping room with a kind of suite with a separate seating area. The room divider is supposed to hold the TV, which should be mounted on a swivel so that you can also watch a movie from bed.
We actually hadn’t thought about workspaces. The studio in the attic was supposed to serve as the office.

I think this idea is great in principle and feels comfortable. You should seriously consider beforehand how it will be and whether you will actually use it that way. I like it, but as soon as you’re not careful, it becomes a place to dump stuff and eventually more of an open storage room. Then you have achieved exactly the opposite. You should honestly examine yourself about that beforehand!

We actually like the balcony if you want to get some fresh air for a bit.

You mostly see or read that somewhere in an advertisement, right? I don’t believe it often happens that someone steps out briefly onto the balcony just to get some fresh air. Maybe the smoker, but then the smell comes back into the upper floor... I would only have a balcony in the upper floor if I also used it often as a place to sit, watch, and unwind. Considering the costs, I would look very closely at whether I am that kind of person. If yes, then I want a nice seating area there, a view, etc.
What I honestly find somehow bulky and overloaded is this roof shape with the two gables/dormers.
I somehow get the impression that you name your ideas and the draftsman more or less enters them directly without paying attention to a coherent overall concept. This won’t be a cheap house, and I would invest in an architect/interior designer to avoid ending up with an uncoordinated collection of individual things.
I know for myself what I find beautiful, but I like to have someone at hand who knows how to realize it.

I don’t find 20sqm too big for a children’s room. Children have a lot more furniture than parents do in the master bedroom. I think they deserve to have a sofa with a reclining part or a bigger bed fit in there. Then maybe a large wardrobe, bookshelf, desk... I always had about 20sqm and thought it was good. Not too big. I also liked coming back to the house during semester breaks.

It’s not a question of whether you want to grant it to the children, and another question is whether the children feel the same way we want to believe. If you watch those house-building shows, you see that the little ones always run around our rooms and take the toy elephant in their hands or play with a little car while the worried father taps the wall for inspection and the mother enjoys the “child-friendly” colors of the duvet. The little one is still playing with the elephant in the meantime. Therefore, size alone is not a decisive argument; otherwise, we older people would all have become mass murderers since we sometimes slept three to a 10sqm room for years. I believe that often people project their own wishes/ways of thinking onto children, which is not meant to oppose a larger children’s room. I rather believe that it almost doesn’t matter and the child can be satisfied either way or not.

The terrace is in the north, entrance in the south

Ok, well then ... and that when you could nicely create an entrance right next to the garage (in the east).