We had a great week-long stay at Omar Do Rio's apartment near Arpoador in Copacabana. The apartment had plenty of space, was spotlessly clean, and had great amenities like new, quiet air conditioners, fast internet, washing machine, and a convenient Nespresso coffee maker for a quick coffee in the morning.
Very nice access as well with one entrance to the apartment complex directly out the front of the block to the beach, and another to Ave. Nossa Senhora for easy access to shops/taxis/ubers.
Good value for the space and location, would definitely recommend.