Just as a note, this was my first experience in a hostel so take this with a grain of salt.

Singer Hostel was impeccably clean, staff was fantastic with suggestions and kindness, breakfast was plentiful and the UBahn/SBahn were only a 5 minute walk from the hostel. It's not a hip neighborhood by any means but everything was easily accessible by public transport.

For those who need a quiet place to sleep, I'd recommend asking for a room that faces the outside of the building as our room faced the courtyard - people are very noisy coming in and out at night and there were many large field trips. The elevator was broken twice during our 5 day stay, which wasn't that big of a deal as we were only on the 3rd floor. On our second night, there was some trouble caused by a group of high school kids and the security guard knocked on our door at 2am multiple times (still not sure what he wanted, I think he didn't know what room they were in?) until we woke up and answered, which made us nervous and uncomfortable. The rooms were a bit warm, so we left the windows open while we were out for the day, and it very much smelled like cigarettes every time we came back.

My travel companion had stayed in hostels before - she remarked on the cleanliness and said she would definitely stay there again. She thought the mattresses were INCREDIBLE (me too, actually).