Single-family house floor plan architectural design

I don't like K1... I might even prefer to make two equally sized tube rooms... something like this:

2.80 with open height: that has nothing, just something tubular with more height....

Thanks first of all for the suggestions. It’s not so easy after all ;) We don’t really like the attic. The bathroom is definitely too small for us. The bathtub has to be that big, otherwise I can’t use it. And we wanted the children’s rooms to be at least 14 m2. I think the upper floor still needs optimization. What do you think about the ground floor? The dining area should be wide enough now, right? I somehow don’t like the pantry like this. The hallway should be okay like this, so that you can place a closet/wardrobe on one side, right? Do you have any tips/suggestions for the ground floor?

We don't know at all how our suggestions are received without feedback...

mh yes, I did give you feedback. I had written that we changed the floor plan based on your tips and suggestions. See for example the dining area being wider, pantry in the kitchen instead of in the utility room. That’s exactly why I’m asking again what else should be reconsidered, we would really like to get to the final floor plan soon even though there is still a lot to do.

The staircase ....

And, if you don't like the upper floor as it is (I also don't like that one of the children's rooms mainly faces north), then maybe you have to break away from the overall concept and start over.