Looking for house handover problems and solutions?

Are you sure about that? Check the contract again, usually this is a standard clause when you buy such a new house from a private seller.
In our case, it was somehow worded along the lines of "The sellers assign the .... blah blah ... claims for performance, warranty, and damages to the buyers. The buyers accept the assignment." Also quite far towards the beginning of the contract.

Is the appropriate part included here?
Or is it missing?

Is the appropriate one here?
Or is something missing?

Second page, after the "Ggf", it looks very much like it. But why does it say ggf?

Second page, behind the "Ggf", looks very much like it. But why does it say ggf?

I guess that was the draft contract and the notary wrote it in as an option

I guess that was the draft contract and the notary included it as an option

Yes, that was the draft contract.

What do you actually think about the floor plan?
It was an open design:

What I like:
(8.5m * 10m = 130m2)

* Storage room under the stairs
* 5 rooms
* equally sized children's rooms
* window in the stairwell
* possibility to separate the living room with a sliding door
* high knee wall
* access to the garden from the utility room
* high ceiling height

What is not so special:

* Utility room not usefully usable, out of 9.5m2, 2m2 are lost (passage)
(I would have left out the shower on the ground floor for the utility room)
* Attic hardly usable <1m max. height (but at least it is insulated)
* Living room somewhat very small (more than sofa, sideboard for TV, fireplace and a small table do not fit in)
* No wardrobe (1.60m wide hallway) = main wardrobe in utility room passage and a tiny one in the normal hallway
* Suspended ceiling in the study and door opens inward (supposed to become a sports room)
* View from the bedroom directly into the neighbor’s living room.
(The plot is about 46m * 23m wide, maybe it could have been different)
+Carport behind the house without turning possibility = 20m + reversing every time) so I will use the small lawn right in front of the house much more for the car.
* Location orientation not optimal for photovoltaic system
* The porch could also have been built as a balcony, master bedroom.

General: about the house:

Great
* Electric shutters
* Ceiling spotlights
* LAN sockets in the rooms... which I don’t use myself
* Motion sensor lighting installed in hallway, stairs
* Heavy-duty power connection. But why in the apartment and not in the garden (meter cabinet)
* Water connection in the garden
* Fireplace

Negative:
* Heating air-to-air heat pump
* Too few power outlets (2) but 3 empty conduits to the garden, carport, driveway
* Water meter not in the house!!!? But in the driveway in a shaft?!?
* No outdoor lighting on the terrace

**** It is what it is, and comes as it comes****

All a big improvement over now, panel building 64m2 3 rooms. (and
5-8?!? pockets above in 75m2?!?)

I took a new picture of the upper floor since the other one wasn’t nice.

Solid floor plan. I do not find the living room too small - appropriate for the overall size. I would actually need the office more than a gym.

Solid floor plan. I don't find the living room too small - appropriate for the overall size. I would actually need the office more than a sports room. ;)

Eventually I will get rid of it too :/ The desk is initially moving into children's room 2, which will also be a guest room.