Marcia has a great place to stay in Rio. We loved the apartment, it was clean with a nice view and good shower and bed. It is right at the beginning of Copacabana. Definitely recommend the place, though I felt it was a bit overpriced, as it was the carnival time. Be prepared that most of the people don't speak English, and translation sometimes gives errors.
Otherwise, a super nice place with everything you need to enjoy a stay in Rio!