I stayed here by myself for a few days before starting an Intrepid tour. No real complaints about the Rio Roiss. My room was clean, and the hotel is well located in Copacabana with supermarkets and plenty of places to eat in walking distance. Best of all, the hotel is a block from the beach, with a good view from the dining room (not so much of a view from the rooms).
Staff were friendly and helpful, and breakfast buffet in the morning had a nice selection of fruit, breads and cakes.
Room had a safe, TV had excellent selection of channels, and the flow of water from the showers was pretty powerful.
Only complaint for me was my air conditioning sounded like a rusty chainsaw. I was staying in the rainy season, so I didn't find myself needing it too much at night.
Internet is available in the lobby only, however I was able to get Wi-Fi from the hotel next door from my room.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC