The apartment is great, exactly as it appears on the photos and as described by Janaina. Very close to Copacabana beach, walking distance from metro stations and taxis are available in front of the building. The air conditioning works very well and the place is really quiet during the night, since it doesn't face any street directly. I felt safe there, as well, since everyone must identify in the reception to get into the building.
Janaina was always available via Airbnb for any questions, and always worried if everything was ok with our stay. I highly recommend her as a host and the apartment as a great place to stay in Rio.