I will reiterate what others have said:
1 - Location right next to Dias Ferreira in Leblon is excellent with some of the best restaurants and nightlife in Rio.
2 - The apartment is very well kept and well laid out. Ideal for cooking with a major supermarket right next door. Daily cleaning + access to building amenities. The building entry is very secure with a doorman 24/7 and fingerprint access needed to use the elevators.
3 - The owners were very responsive and attentive throughout my stay.
All in all, I would put this at 5 out of 5 stars.