Very nice place. Extremely clean and functional, and also convenient and in a safe area. It really is what you want from a flat in Rio!
Carlos is terribly friendly and very helpful, and so is the building staff who are also accustomed to having tourists in the building and can help you with keys etc.
What we loved the most was being so close to the beach, which makes it perfect for a dip before and after your sightseeing. However, we would recommend going further to Leblon (after "posto" 9), as the crowds are a lot nicer and feels safer, rather than right in front of the house.