It's a small apartment (one bedroom), located in a old building in Copacabana. For those who don't know Copacabana, all the buildings are old there, with poor conservation. The apartment is clean and was remodeled and it fits properly for a couple or a single person. Sofa is not large and not very useful as a bed.
Maria Teresa, as a host, is great! Very nice and cordial, answering all the messages quickly and precisely.
Regarding location: near to the beach (two blocks) and near to metro station (five minutes walk).