Brilliant for hostel standard. Everything is extremely clean and comfortable! The kitchen was brilliant too!
The location is clean. But a bit overpriced. Only two public showers for all the rooms. The shower is immediately behind the toilet door entry without any privacy - that is quite strange. Also the owner could be a bit more friendly. Was in a big hurry. The walls are very thin, so you can hear everything what is going on in the other rooms. The wireless did not work in the evening - the next morning it was ok. For 70€ the night you can also find a hotel in Potsdam. The location of course is very nice - next to the big castle and also on a very quite street.
I really enjoyed my stay at Quartier hostel. The room was clean and lovely. The staff was friendly and helpful.