Lapa in center of Rio de Janeiro is known as the bohemia neighborhood of Rio. For the more adventurous traveler, this area can be well worth a visit. There are numerous guesthouses and Hotels available in the neighborhood, and if you plan on partying with other Brazilians it is advisable that you stay in the area.
The area is the most genuine area that is advisable for foreigners to visit. That being said, most people from lower classes goes to pubs closer to their homes. On the other hand, many people of less modest means prefer places which are more classy. The genuine in a diverse country as Brazil is an illusion.
In Lapa you will, however, find pubs and discos with a wide variety of music styles.