I lived from 2014 to 2016 in a really cosy flat with a sloped ceiling in downtown Lisbon. I literally moved away from there solely because the unit beneath mine turned into an AirBnb rental and there were constant loud parties all night long pretty much every other day. Not to mention people leaving the building door open, the rapid degradation of the stairwell with all the tourists dragging their suitcases (and the fact that the parties often extended to the stairwell).