For the small house, I would allow the staircase a maximum of 2.20m – rather only 2m. That is really narrow, but it is also truly a small house! Then the storage/shower and the bedroom would also be bigger...
I find the kitchen solution interesting. However, you only have 1 tall cabinet now. Is that enough? We really only need 1 for the fridge, but we still have plenty of wall cabinets for the dishes. Otherwise, it will be a lifetime of rummaging on the floor. Maybe something else is possible there?
Be sure to draw the chimney at the top so that the cabinet can be planned.