Positives - cheap, 20 min walk from station - though if you're leaving during the night, be aware make a wrong turn and you'll walk through the red light district where gangs of males loiter!!
Negatives - NOT a backpacker hostel, be warned, just a hostel - shouldn't really be on travel sites. No secure place to store your stuff - at least not large enough for backpack/suitcase. People running around the building in the middle of the night.
I'd pre-booked a mix dorm having used these in Poland, Austria etc (diff company) - got to the dorm a middle aged man, got up from his bunk and started yelling at me NO WOMEN!! til I left the room (cos you know we plant eggs in men's brains whilst they sleep!!) the next room I was put in - a female dorm for 6, had one occupant only (even though this very website said all female dorms were booked) she'd been there for a while cos all her stuff was everywhere and it was like sleeping on a mate's couch. 12 floors with 2 dodgy lifts - I gave up and went back to the station at 3am, felt safer (hence finding out about the red light district!. You'll see ads in Germany trying to promote this chain as somewhere to stay - DO NOT USE!!