This was a very nice hostel, clean rooms friendly staff, kitchen facilities, lounge and a luggage room. No curfew, keycard opens front door after it locks (staff can also be summoned if keycard is lost) It is located between the U-Bahn stop of Hallesches Tor and Möckernbrücke. If you cross the bridge that is right by Möckernbrücke there is a pharmacy and a nice cafe right there. take the U-Bahn to Warschauer Str. and you are close to the East Side Gallery (recommended) and a lot of good cafes and pubs in that area too, also a Lidl there for groceries (walk through the underpass) also connects to S Bahn that will take you you Alexsander Platz and the Hauptbahnhof (main train station) So public transport is not a problem when staying here. Beds are comfortable, if you need they have bedlinens for 2EUR or you can use your own. However, the hostel is right next to the U Bahn so you will hear the trains going until 1am... not loud but just something to consider, earplugs might be a good investment. In fairness it was sunny and hot during my stay so we slept with windows open.
PS! All rooms have their own shower and toilet plus there are "extra" toilets on every floor.