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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.
So the place we bought has mould on the window seals (pictured). This is obviously beyond a good clean, short of changing the window, what can we do? The rubber seal feels dry to the touch if that makes any difference.