Enjoyed staying at Richard's loft in Leblon. It's in a really good safe neighborhood and easy walking distance to the beach, restaurants, and bars. There is a upscale supermarket one block away with everything you will need for your stay.
The loft/apartment is small but well designed like a tiny house. It is fine for two people and even has a combined washer/dryer. There are also two bikes available for use and I definitely put some kilometers on one of them riding every day either around the lagoon or from the Sheraton hotel past Leblon down to the end of Copacabana beach and back.
Richard is always available and not far away if you need assistance or recommendations. I tried to extend my trip for some more days but could not get my flights to work out which is ok, I will just have to come back for another visit.