Stayed for 5 nights during carnival. Exceptional value, walkable 2 min to Copacobana Beach (amazing), close to all bars and restaurants.
The flat is freshly renovated, sparkling clean and in a good house, concierge 24h.
Rio is unexpectedly safe, i still have my expensive iphone and all belongings. During carnival streets were full of people drinking, party and fooling around, it was safe and cheerful.
I watched Carnival Rio 2020, very easy (best way) to get to Sambadrome via subway - 5 min walk from the place.
Uber is best option to get around in city, ride is 2-4 eur, to the airport 10 eur.