Single-family house with a hip roof, approximately 340 sqm

What exactly is a 30cm low slope? Slopes have the property of not being able to measure a constant. So, I need at least 166cm ceiling height so that with a height of 165cm I don't hit my head... 30cm is not even enough for a bed frame height... our bed is already 45/110 high, and that's not exotic! Sorry, but I can't follow your attempts at explanations.

What on earth is a 30cm low slope?
Slopes have the property of not being able to measure a constant.

So, I need at least 166cm ceiling height so that with a height of 165cm I don’t hit my head... 30cm is not even enough for a bed frame height... our bed is already 45/110 high, and that’s not unusual!
Sorry, but I can’t follow your attempts at explanation.

I would say the knee wall is meant? That it is 30cm lower in the current home than then in the house and that’s why the bed fits well there.

But maybe family mxx_muc is also much smaller than us :D

In the new house, it is then 1.20m.

Ok... then it remains the case that without the 2-meter height indication one is truly just wasting time here :(

"House so big I haven't seen them boys in two days//
bxxxx, I use a walkie talkie just to get a beverage".