This lively hole-in-the-wall bar in Humaitá with outdoor tables and cold beer is the new trend in the neighborhood. A band of chorinho plays on Sundays and the place gets packed. Try to arrive at at 7pm to get a table or stand on your feet drinking like the cariocas do.
Great local vibe, good music and no adicional charges for it. On Sundays you can hear great Brazilian chorinho for free. It's an authentic "boteco", with ordinary food, cold beer and caipirinhas at a reasonable price.
I usually go on Sundays but on Thursdays and Fridays you may enjoy too.