Thanks first of all for the feedback.
Our thoughts about the GZ were that it becomes a flexible room that adapts to the respective situations. From home office, creative corner, playroom and eventually a bedroom, in between sometimes a guest room. A direct access to the hallway would have advantages, but we did not want more hallway space...
Regarding the KZ in the west, I should probably still say that three plots towards the east have a busy street. Therefore, we placed all bedrooms on the western half of the house.
We will consider enlarging the bathroom in favor of our bedroom.
The WC on the ground floor is such a thing, I simply find a separate WC important. We have not yet found another solution including an exterior window.
Thanks for your sketch, we had that position once as well :) and discarded it again. If later the upper and ground floors are separated, the WC and bathroom are in the hallway area.
Best regards