AirBnB is part of the problem btw. There are at least 4 fulltime AirBnB flats on my building floor (that I'm aware of). I'm assuming it's AirBnB because there's a very high "fluctuation" of new people in those flats (few days to 2 or 3 weeks). Imagine if all those AirBnBs would be available for longterm renting ;)