In Bucharest one can rent a 50sqm flat for about 400E per month (all expenses paid) in a decent neighbourhood. Prices have been steady since 2009. I shared a couple of bigger/smaller flats with 1 or 2 friends throughout college but now I live alone since I work from home (quite boring though). Usually people rent in groups in their early 20s mostly due to financial issues but afterwards they prefer to get a 30y mortage to buy their property since the cost is arguably the same and most see rent as wasted money (not necessarily true though, mortage definitely has its downsides)