Bikini Club Barcelona
Awesome nightclub, multiple rooms with different music. Drinks are a bit expensive, but you don’t really want to be buying too many drinks in nightclubs anyway (predrinking is very cost-effective, especially considering how easy to get and how inexpensive alcohol is in Spain!).
I went on a Thursday night and cover/entry was 15 €, and you got a voucher for two drinks. During the weekend it was also 15 €, however you got only one drink.
Had a really good time with my buddies, however I wish I had learned Spanish/learned how to dance salsa so I could interact more with locals. If you speak Spanish/know how to dance it’ll make your experience much better, especially considering there’s a room dedicated solely to salsa.