Hmm, I think that maybe you are thinking of the Testaccio area across the Tiber from Trastevere, where there is a whole complex of nightclubs together...the place I am thinking of is in alley off of another small street in the maze that is Trastevere not far from the Santa Maria in Trastevere and the fabulous Hotel Cisterna...I will have to do some more research! Crazy place...but while we're on the subject, if someone is ever in that area, they should definitely check out the straight bar TRANSYLVANIA, which is built underground and decorated exactly like the catacombs! Gross and wonderful...