Hey, guy, the best-known Latin bar in Miami is Azucar in Little Havana, but you may consider that a "fancy club" ... I wouldn't call it a barrio bar, certainly. The popular new spot is Sandals on 79th Street (in the space formerly occupied by the old Cupid's Cabaret stripper bar). But I'm thinking the bar closest to your description would be Jamboree on Biscayne Blvd. It's dark, divey, cruisy (esp the back patio), very friendly, and overwhelmingly Latin. Have fun!