House handover: which defects are acceptable?

Well, often moving in is considered acceptance according to the GU-/GÜ-/developer contracts. So I would definitely still make sure to protect myself.

Thank you very much for your answers!
then our heating is not properly adjusted.
And today it completely broke down - it had a leak for weeks, yesterday the plumbing company finally came and fixed the leak - and probably destroyed something else in the process, perfect timing before the weekend.

Unfortunately, we have already paid the (money-hungry) electrician for his additional services.

Self-awareness is the first step to improvement