first of all, many thanks for the doors in the plan. :)
Regarding the plan:
Ground floor:
I assume that the room with the car and the adjacent storage room will remain unheated. If so, the washing machine is misplaced in my opinion, because it could freeze in winter. Overall, the space would be quite unsuitable if I consider the walking routes.
The same applies to bottles and everything else that could not be stored there if that was meant to be a pantry.
Now you have painstakingly torn down the walls, but the sofa at the top of the plan looks quite lost in the living space that has now opened up, measuring 10m in length and 4m in width. Apart from the tunnel feeling of the room, it quickly turns into a hall. This does not create coziness. Especially not if guests constantly use the toilet right next door without the bathroom being separated from the living room. There is only one door in between. That is not enough to feel comfortable.
The room at the bottom right, which belongs to the living room, shows no use except for a galactic cupboard. Yes, yes, three children will surely scatter their trash there. I wouldn’t worry about that either, but they have the same space upstairs as well. Plus the children's rooms and the basement room. You’d have to have that much trash first. Next to it, the generous dining table offers plenty of room for games at the table. So what to do with the hall? The architect probably didn’t have an idea either. In such cases, a grand piano is usually placed out of desperation - I’m still waiting for that.
Upper floor:
Yes, sloping walls are a pain, especially when they are this long.
Aside from that, the laundry room here is too tiny, the dressing room cramped, the master bathroom a joke (no client would want to “live” like that), and the children's room right next to the bedroom uncomfortable for both parties.
The compulsion to let all children face the garden is nonsense. Basically, the corners of a house are the chocolate parts of the house. You would expect child 1 there rather than piled up next to each other squeezed against the bedroom. It only looks nicely German orderly on the plan. In reality, it’s nonsense.
The bed in the bedroom stands with the foot end at the window? The nightstands, however, are consistently at the feet? That is more than odd. Basically, having a window behind the headboard is usually uncomfortable. So I don’t see the bed placed like that.
Apparently, there is a knee wall at standing height or something similar. What exactly is that? How is it in the extension?
Conclusion
On the ground floor I would:
- isolate the bathroom from the living room or better yet, immediately put up a partition wall at the height of the chimney to zone the hall and banish the noise from the toilet and shower.
- I would declare the current sofa room a guest room and the guest room an office to relieve the parents’ area upstairs.
On the upper floor I would
straighten the wall - presumably to the advantage of the parents’ area. Rearrange the children’s rooms and disconnect them from the bedroom. Move the office downstairs, redistribute the bathrooms - that also depends on the drainage. Maybe I’ll puzzle a bit but only if a decision regarding the office and living room is made - whatever that looks like.