Celia was a great host! You can't go wrong staying at her place! She was at the lobby waiting for us when we arrived (WhatsApp her when you leave the airport so she will have enough time), showed us everything in the apartment and chatted with us a bit before she left. throughout the stay, whenever we have questions and want to ask for recommendations about Rio's restaurants, she replied promptly. also she arranged transportation for us to the airport which was great.
for the apartment, everything is well appointed even though we didn't get to enjoy it much except sleeping there. Rio has a lot to do day and night so it's more as a place to sleep for a few hours and get going. the apartment is about 1.5 blocks(2-3 min walk) from the beach, about 5-7 min walk from the subway station, very convenient as the supermarket is just around the corner, many shops and restaurants by the building, currency exchange is around the corner too. quite a few juice bars are on the way to the subway station and the sugar cane juice and acai juice are must try. you def can comfortably accommodate 2-3 people in her apartment. also, she put some beer and candy for us to try which was a nice touch.
we were there during the Olympics so the price was a bit high but it was expected. for the normal price, it's a bargain due to the location. if you are a tourist, you should stay in the south zone (zona sul includes Copacabana/Leblon/Ipanema) as these areas are much nicer and safer than the downtown or other areas (other areas could look scary at night).
Rio is a beautiful city and hope this review helps!