Thanks already for the feedback!
Yes - it is plot 17, the utility room would then be in the northeast direction.
The change in the arrangement of bathtub/toilet was already on our list, we want the bathtub on the wall.
Maybe an extra toilet on the upper floor would be useful.
Otherwise: the main point is stairs/hallway - more light upstairs would be possible by omitting the storage room. But you have so far confirmed my criticism that a wardrobe is missing/the entrance area is small and therefore the space is not optimally used.
What would be a concrete alternative? A half-landing staircase located between the study and living room? Straight staircase across between the study and living room?