Compared to other hostels around the world I would definitely rate Circus as a boutique hostel. You can choose between dorm style or private rooms. Dorm beds cost from 15€ and are fun if you go with a group (note: no hen or stag parties allowed).
Last time I rented a private room with ensuite bathroom and it was cleaner and bigger than the last expensive hotel room I was in. Rates were about 38€ per night for the private room.
The staff are ever so friendly and speak lots of languages including perfect English. They also have lots of money saving tips for you including a weekend metro card that gets you and a friend unlimited travel on the S and U Bahn.
The hostel is in Mitte which is in central Berlin and therefore not too far from most sights and easy walking distance to funky areas such as Prenzlauer Berg.
Oh, and they do a great all-you-can-eat buffet breakfast for only 5€!
10119 Berlin, Germany
+49 30 28391433
U Bahn: Rosenthaler Platz (very close)
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