Thank you very much for the helpful feedback so far. Basically, the draft seems to fit (stairs, entrance, room layout). At least, I haven't read any comments about that here. Regarding the rooms, the kitchen/dining area is certainly the somewhat tight space. However, I don't know how this could be fundamentally solved better without significantly impairing the open character. We will look at the kitchen planning to see how to solve it in detail (e.g., microwave integrated into the oven, dishwasher built-in, etc.) to save workspace.
Is there an idea where the room concept of the house basically works differently by planning or placing the stairs differently? The house is open to the west because of the hidden garden there. To the south is the neighboring house with a 6m distance.
I am still very grateful for creative ideas.