The other comments are true. I was at Mama Africa this weekend in Cusco and you will meet lots of other backpackers as well as some locals. It´s a meat market but you can get over that.
The only really bad side to it which ruined our night there was the fact that you don´t get change. I paid 50 soles (about 17 US$) for a bottle of water which was supposed to cost 5 soles. I asked for my change (in Spanish and English) but was completely ignored. Another of my friends ordered a rum and coke and a water and go NO CHANGE out of 100 soles (over 30 US$). She asked to speak with the bar manager when the bar staff refused to speak with her for her change but he said they were too busy to deal with it.
I did think we just had a run of very bad luck but I have since heard alot of people (all tourists) say that they have been ripped off with change to some degree.
All in all a very expensive night. Theme: NightclubAddress: Just on the corner of the Plaza de Armes