Thank you for your contributions! This is the first draft after all, and you have also mentioned some things that we don’t like so much.
The granny flat is not necessary, but as suspected, it would be the office / dressing room / WC.
I also find the living room too long; I might possibly divide it so that you have the couch/TV in one area and then, for example, a reading corner with a fireplace facing the hallway / kitchen.
The island is too small—I have already discussed this with the kitchen planner. I wonder if there is even enough space for workspace and cabinets.
I don’t know if it would make sense to swap the living room with the kitchen, with the dining room in the middle. But I think it’s better to have the living room in the west for the evening sun and the kitchen in the east for the morning sun. However, the pool must stay in the east, and I find it better located in front of the kitchen so you can cook and watch the children. There is also little space for the terrace in the west, and it should be next to the kitchen.
The children's bathroom will be bigger—we will include the bathtub there and then have a smaller master bathroom without a bathtub (no time for bathing with 3 children).
The hallway upstairs is exactly like in the KiGa, that’s true! But it’s not clear to me how we should change that. The south side (with the mountain view) is by far the nicest, and it would be great if all bedrooms faced south. The street is on the north side, and neighbors will look in from the east.
I would have no objection to changing the stairs; they don’t have to be straight, although I think that suits the house style.