It would be impossible to overstate how comfortable we were in Eneide's apartment: its big (really big for Rio), its well decorated, its cozy, it has all the necessities and more, and rooms for guests. Its also perfectly located on the edge of Leblon. You can easily walk to: the beach (Posto 11 -- the best part), the heart of both Leblon and Ipanema, Dias Ferreira street (bars and restaurants), and the front door opens into a subway station. Restaurants, bars, shops, pharmacies, and boutiques all within a few blocks. And the apartment is on the 11th floor, so its not too noisy at all.
Eneide was a perfect host. Very nice and very responsive, and she even left some toys and a crib for our baby (he loved the toys more than his own). The building staff are also incredibly attentive and friendly. Good people all around.
My wife was born and raised in Leblon, and Eneide's apartment made her feel truly at home. We had a wonderful stay. Couldn't recommend high enough -- the combination of size and location is awfully hard to beat.