Yesterday, the floor was installed in the basement. That's where our guest room is, and it also got underfloor heating and a spruce floor. We have a solid wood basement and decided to leave the walls in the rooms in industrial quality as the basement was originally built. That is also spruce.
Now the guest room looks more like a slightly oversized sauna:
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The furniture will definitely NOT be made of wood, so there will be a contrast here
The basement hallway walls are white and the other three basement rooms (storage, workshop, and freezer) are pure functional rooms without underfloor heating and the floor is still in its original state, meaning the bare wooden floorboards with which the house was built.