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The rooms are not controlled and the corridors do not have their own heating circuits (because there is no space). Here too, all pipes are laid so that there is 10 cm of insulation and the room is heated equally like all other rooms.

You then have 10 cm of insulation in the corridor, but it is not a separate heating circuit where the temperature decreases with the running meters of heating pipe; rather, "hot" supply lines always run through the corridor. In my opinion, these should be insulated, otherwise there is a risk of local overheating.

But well, once the screed is in, it is like that now. But maybe keep that in mind for future homeowners.

Why should the largest installation spacing be chosen in the coldest room (basement)? The reason does not make sense to me.

Since the basement in winter at sub-zero temperatures is not exposed to exterior walls with sub-zero temperatures, but rather about a constant 10 °C (ground), the VA can be chosen larger here.

What would you as the building owner give the heating engineer as a "wish" for the underfloor heating? Unfortunately, I am not familiar with the topic, and as of today, I would say: "Please lay the loops as close together as possible so that the flow temperature can be low."

Since you cannot tell by looking at the heating engineer whether he is any good, just ask if he would carry out the work according to the planning of a TGA engineering firm commissioned by you. Then commission them with the desired room temperatures and the request for the lowest possible supply temperature.

Unfortunately, I have to close my studio due to working from home.
Home office + kids + open space don’t go very well together :rolleyes::p

It's a pity if that gets shut down. Instead, imagine something like the Alcove Cabin from the Brüder Bouroullec there. Sound insulation works and you are not immediately visible.