Bathroom layout: Arrangement of bathroom components for a 7.5 sqm bathroom

I would initially consider the windows secondary. 2 windows for a 7sqm+ room will be sufficient. Since it is not a living room, it does not have to be brightly lit like the kitchen, where you also work. So: first furnish, then the windows. Then the door could probably also be made to open outwards?! Towels can be stored well by placing a board from wall to wall above the door and displaying the towels there, rolled or stacked. A basket can then also store other things that you are not thinking of right now. For how many people is the bathroom intended? How many people will be in there at the same time?

how about this? Bathtub in the niche, then toilet and sink on the left and shower and towel radiator on the right?

Yes, theoretically the bathroom door could also open outwards, although that would of course not be optimal.

It is a renovation of a small house from the 1930s with a crawl attic and a small basement room with a height of 1.70m, which cannot be lowered (step-by-step method) without an uneconomical, extreme , dried out, insulated and made usable as a utility room.

One would need to see the floor plan of the story.