Floor plan design - Tips and remarks

We have about 2.2 m at the bottom and 2.4 m at the top (although it now looks as if the last step at the top belongs to the floor structure) - the width is 2.25 m. It is okay to good - as said - there are certainly more comfortable ones - half-turned stairs tend to have steps that are not all the same width.

... what ceiling height do you have? And with that, the slope of the staircase?

Clear room height is approximately 2.60 m. Rise is 18.5. 22 cm ceiling, 14 cm upper floor construction. 16 rises = 2.96 m - does that fit? 296 - 22 - 14 - 260 = 0 :D

Children's room huge, children's bathroom just a storage closet. The chimney flue won't be that small (on the upper floor), so you might have problems with your doors. Felt little light in the living area, only one window in the west and one in the south, plus a very narrow structure. I WOULDN'T want it like that, but with the staircase arrangement and the entrance area in the middle of the long side, it can't be done any other way.

The way you have planned the fireplace, it senselessly limits the living room to a very small size - I would place the fireplace & stove on the exterior wall and much more centrally in the floor plan - then the shaft comes up in the children's bathroom - that can be enlarged and for that the children's rooms made a bit smaller - they are anyway somewhat very generous - meanwhile, your bedroom is terribly cramped.

Children's room and children's bathroom I find quite acceptable. Bedroom size is also fine - I would furnish it differently: