Had a great stay here over four nights. The staff behind the counter was consistently warm and helpful. The hostel has many amenities included, and even more that you can access with minimal extra charge (2€ for a towel, 5€ for a late check out, 5€ for a full breakfast). And the interior is surprisingly well-appointed for a hostel. I stayed in a 6-bed room, and while it was never full each of the people I met were respectful and friendly. Last but not least, it's walking distance to Berghain AND Alexanderplatz. :)