Mark T.
Yelp
An awesome, cheap, clean, conveniently located hostel in Berlin.
Location can be a little tricky to find. To find it: take U-Bahn to Senfelderplatz, exit the station at the side without the elevator. Take a right and cross the street as soon as possible. You will reach an arch with writing Pfefferberg. Go up the stairs, go the to end of the "square" and take a left. You should see a neon sign saying "hostel". Take a right and the door immediately on your left is the hostel.
Rooms are clean, beds are made (no fumbling getting the sheets on), and doors and lockers are chip-key controlled. Beds are comfortable, and big points for a shelf with outlet and light. However, the blanket is very thick, and the hostel has no AC. You could always pull it out of just use the sheet, but a thinner blanket for summer may be a better bet.
Bathrooms are very clean too. Men's shower room also provided body wash, hair gel, and body spray. Also, what people are saying about showers being in delay is wrong. Showers (at least on the first floor) are hot, have amazing pressure, and stay on as long as you want.
Common area is nice, but has a bit of a party atmosphere, especially towards the evening. Music is decently loud (not deafening, just don't expect to be making any phone calls). Big TV screen, and computers (Linux, awkward keyboards, no USB ports.)
Wifi is good, but not the fastest (about 4 Mbps), Skype or VoIP calls may be challenging. Only works in lobby, not rooms.
Staff can be hit or miss, some are nicer than others, and some know more information than others. (Not all staff are the greatest information source about Berlin) Plenty of informative flyers though.
Free city tours have a pick up at the hostel.
Location is nice, quiet for the most part, but depending where your window comes out, you may encounter a little noise from a nearby club. Proximity to U-Bahn and Alexanderplatz is unbeatable.
Overall, not perfect, but for about 15 euro a night (when I went) the value is tremendous.