Our stay at Paula's apartment was fantastic. It was so sparkly and clean, and while it's a compact apartment my partner and I felt like we had heaps of space. The location is great, close to Ipanema and Copacabana - we also hiked up Christ the Redeemer, as the entrance via the botanical gardens is only a few km away.
The pics on Airbnb are spot on. The place has been recently renovated. The only thing we didn't pick up on from the photos is that there is no view. The window over looks the outside walls of nearby apartments. But we didn't detract at all from our lovely stay.
While we were there we had a problem with the plumbing (the shower tuned on whenever we flushed the toilet). Paula was responsive and had the problem seen to ASAP and therefore this really wasn't an issue - and Paula left us chocolates as way of acknowledging any minor inconvenience - which was a lovey touch.