The positives:
Close to both Ipanema and Copacabana beaches
Very close to the metro
Quite spacious
Great communication with hosts
Felt very safe
Negatives
There is a noisy bar downstairs with live music until 11:30pm 5 nights a week, the street itself is also very noisy with traffic. The windows don't block this out.
The flat itself is a little tired and dated (be careful when you open the drawers in the kitchen).
The sofa is also uncomfortable.
The wifi is slow.