Floor plan, living on one level, please provide criticism and suggestions.

With a 500 sqm plot and a bungalow, I would be concerned about the neighboring development, not that on 3 sides town villas with 6m high walls and a 3m boundary distance are built, and suddenly it is dark inside the house

I was once in a house/villa where a staircase led from the living area to the gallery. The gallery was a library with a nice reading corner and access to the children's rooms. It was balanced and really very beautiful.
Maybe this could also be a solution here.

However, 50sqm of airspace is no longer nice either, because you get a cathedral character that makes the room uncomfortable again. Conscious zoning of an airspace is just as much a part of house planning as kitchen planning.

I see it the same way. I really like galleries and that’s why we have another one, but over 63sqm in a residential house seems clearly too much to me. We also wanted to be rather bold and were not afraid of many and large windows, but such a room should also fit the overall spatial concept. On the one hand, I see this jumbo gallery like in a church, but then a rather dull micro-office, plus a children’s room with a rather boring en-suite bathroom, which the office user cannot access without going through the children’s room. Must you then go down the "horror stairs" from the PC in the office just to wash your hands briefly or must the child always grant passage rights to a bathroom? I don’t like the proportions at all, because being big alone does not help. I also wouldn’t like a really big house on a rather small plot, because for me at least the proportions should be reasonably considered. Our stair builder is also building an ultra-chic hanging staircase that requires a long approach. I would have had this jewel installed immediately, but in the end there was not enough space. To name the described "horror" once. It is usually unpleasant when something unnecessary and caused by planning defects has to be endured for a lifetime. In a flowing floor plan, a stylish staircase is a highlight that one (here probably the child) likes to use. So far, however, I don’t see any stairs, probably because it is perceived as "horror" from the start. But will it be enjoyable to walk these boxy rooms with unnecessary and pitch-dark corridors for a lifetime, or will the former staircase horror then become hallway horror or mini-office horror... If something is thoughtfully planned with nice materials, it will never be a horror. Stairs, doors, windows, access paths etc. only become "horror" when they are planned unlovingly or carelessly. Have you also thought about lighting, sound, and heating for the church-gallery? Who recommended an air heat pump for this huge, open living space and why should it be such one, or where/how will it be installed so that you also get warm downstairs? You have had an active participation so far. Would you like to answer all the questions individually or resolve the respective critical comments directly?

Who recommended an air heat pump for this huge, open living space

? Every property gets geothermal energy.

favored heating technology: air heat pump

I read that differently here in the questionnaire in #15. I was only interested in the why, without criticizing it, also with regard to the huge air space.

I had read that differently here in the questionnaire in #15. I was only interested in the why, without criticizing it, also with regard to the huge airspace.

Well. If it is an air-water heat pump, that's one thing. With an air-to-air heat pump, you probably won't be able to warm the room. Regarding the actual discussion: The longer I think about it, I find the suggestion from best: Gable roof with a third gable. I have to think of various houses in the countryside in northern Germany, where at some point the barn was integrated into the house. They often have really generous rooms on the ground floor, plus a somewhat more functional upper floor. This would allow most of the everyday space requirements to actually be integrated on the ground floor level, shift some of the ancillary rooms upstairs, and thus save both construction costs and floor space, as well as slightly reduce the struggle against the property.