Overall, a really nice hostel at the heart of East Berlin. A few meters away from the S-Bahn and the U-Bahn station (trains that can take you throughout the whole city), friendly place with good receptionists. Nice atmosphere at the reception, clean rooms, nice shared spaces.
However, the bathroom does not have a drain outside of the shower, therefore any water that comes out of the shower cannot be drained somehow, so while I was there, the whole bathroom was wet every time we took a shower (shower door does not cover everything so water gets out of the shower). My biggest problem was with their check out policy. I checked out earlier than expected (two days before my normal check out and I asked the host to change my reservation dates so I could get my money back. Not only did the host replied very late (the next day) on purpose, but they also refused my request. After that, due to their very unfriendly check out policy (50% of the remaing nights 24hrs after the cancellation), I did not get any refund after all but I would have got a refund, if a cancelled earlier, but they denied my request very late on purpose. Overall a good stay, but that one part really bumped me out.