Thank you - I bought some! :-)
Just wanted to share with fellow travelers out there that couples dancing here is a big deal. It's where friends get together for socializing and having fun. The gafieiras are dance halls (saloons) where people come either on their lunch hour or at night to dance samba, salsa, lindy hop etc.
I found a really good one that opens from 12:30pm - 3:00pm on Friday as well as Friday evenings. It's packed with all types of people, young and old. There are some awesome dancers there and many instructors so if you want to take lessons, ask around after it's over to find an instructor.
There is a R$4.00 cover charge and drinks are available. I think a drink is included in that price.
Even if you don't dance, it's fun to watch the experts. Happy dancing!
Dress Code: Casual dress, but dancing shoes help and a twirly skirt makes it all much more fun. Wear lightweight clothes because you will sweat!
If you want to danse on real Samba while driking a good caïpirinha, i suggest you the "Centro Cultural Carioca".
Located in the "boheme" area of Lapa, it is first of all a beautiful old building that has been recently restored.
You can eat there, and around 9 PM, then the live music starts (except on sunday I think), and everybody starts dancing ! Everynight has a different programm, of quality traditionnal Brazilian music : samba, choro... I particulary recommand you the Thursdays with Teresa Cristina and her band, she is a popular singer in Brazil and is excellent.
The clients are very mixed with locals and tourists and people of all ages. A very authentic way to discover Brazilian music and have fun.
The entrance fee is around 15 R$.
Dress Code: No particular dress code.