Unfortunately, I don't have any other pictures on my phone right now. The stair version from the ground floor also fits on the upper floor. I had it clarified by the draftsman. But my primary concern is the room layout
Sorry, but the room layout definitely depends on the location of the stairs. The start and end points determine further dimensions, e.g. hallway and next rooms. After all, even 20 cm can make the difference between something not working or working.
I somehow have a déjà vu, as if we already discussed this before.
As much as I would like to help, I cannot do it this way. Something is always posted here only halfway properly.
Nevertheless, I wish you good luck with your project [emoji4]
Edit: I already found the original location of the WC quite good, placed by the guest room