I stayed at the Circus Hostel (highly recommend as well) and this was right up the street from us in the Rosenthalerplatz. I have seen some pretty horrible reviews about this place, but all I can say is that the night I went, it was great. We met some touring Austrians and hung out with them the rest of the weekend. Atmosphere was great, no one pestered me or gave me lip. I drank probably about 8-10 glasses and threw 20 Euro in the jar and walked out. No one yelled or gave me dirty looks like some people have said. Guess it depends on the night. Go check it out for yourself.