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Got some intel from the caretaker this morning. The building is made of bricks and has no insulation whatsoever, so damp is a known issue and drying clothes indoor is definitely a no-no (there are 2 massive Miele dryers in the basement for a reason). The good news is someone is going to look into refurbishing the windows, and the wall is not too bad (I removed the loose wallpaper on the eastern one and the wall feels dry to the touch).
Speaking of surprises I also found a vibrator at the back of the wardrobe but that's probably for the homeowner thread.
This is remarkably fucked. Obvs. a lot of clothes were dried in this place.