I can tell you some places where you can dance hip hop in Barcelona:
Cat walk, metro station ciutadella villa olimpica, close to the sea.
Shoko Club, metro station ciutadella villa olympica, close to the sea.
Bikini, just wednesdays, metro station diagonal, close to Decathlon.
Otto Sur, metro station Fontana, in Gracia.
i must still say you thanks for your advices, clara!I would like to practice my breakdance moves...