Entrance to the basement apartment not separate, but 1 main entrance small vestibule Straight ahead your hallway/wardrobe area, Entrance to the basement apartment on the right Basement wall of the front room shifted to the left. This way you can set up a wardrobe area on the right in front of the stairs.
Living area basement apartment will also be a bit larger. Whether easier to furnish, no idea. The apartment will also be quite dark, whether it will be approved as living space?
Ground floor Kitchen, pantry and office swap places, as well as Living and dining, possibly let the living room - staircase wall end flush with the staircase
Upper floor I haven’t come up with the right idea yet. Is there a reason that the dressing room is so big? I think there is a disproportion if sleeping + dressing room is bigger than a children’s room. Does it have to be a straight staircase?
I would put a children’s room in the dressing room’s place. Then both children’s rooms have the nice, bright and sunny rooms. Remove gallery.
Left children’s room and bathroom Right children’s room, dressing room and bedroom. Both children’s rooms a bit larger. Gallery becomes office