I stayed at this hotel prior to moving into my apartment in Tempelhof when I arrived in Berlin, so…read morethat is how I heard about it -- the owner's mother is my landlord. At first, I was kind of worried about being in a cramped room, but it was actually a lot nicer than I expected.
The staff are really nice, and it is in a really nice location: close to the S-Bahn station (Julius-Leber-Brücke) and Crellestraße is a great place and close to other streets with lots of good and inexpensive restaurants in Schöneberg. Also, if you are not too confident in your German skills, do not worry, the staff can speak some English and can also help you with your German, as well as the other restaurant staff in the area.
The reservations also come up with free breakfast, offered daily for at least four hours. Sheets and pillows are also available upon arrival, so are towels -- pretty awesome. The showers are also shared, but individual stalls with benches, which I really appreciated. Wireless internet is also available, but the best deal is the 5 Euros for 24 hours (that is a total amount of time for 24 hours, not usage within 24 hours).
If I were to stay in Berlin again and was on a budget, I would stay here. Rooms run for about 50 Euros/night, but I thought it was worth it.