Location is awesome, lots of places to eat and have a drink nearby. Really loved drinking a cocktail at the Dirty Velvet. Also the Mauerpark is a nice place to hang out. The tram is right across the street, subway at walking distance. The hostel itself is too noisy for me. I was at the street side, the sound of the tram, traffic and regular sirenes from the fire department was intense. Also the doors on the inside close with a bang, so bring your earplugs. I stayed for two weeks, but one would have been enough for me. But that is mostly the fact that I had do laptop work and the noise was distracting.
To end with the positive :) The fact that you have your own locker and a place to put your food in the fridge is great. A washing machine would be a great addition. Showers and toilets are cleaned everyday and there are enough at each floor so you never have to wait. Make sure you have an email upfront so you know the codes to check in. Staff is there for a couple of hours each day, did not figure out the system, but they are friendly and helpful when around. Met some nice people in the hostel, the vibe is good.