I spent 4 days in adrianas apartment at copacabana beach - the first night was in the small room without aircon what i definitely not recommend - the other upgraded rooms for plus 20$ or 30$/night are very nice. Adriana and her sons are very helpful and all of them speak perfect english. They are very good hosts and you definitely should go there. In general, for me, the next time I prefer to stay in Ipanema instead of Copacabana.