Just stayed at Karina's place.
This apartment is beautiful, very stylish, clean, well kept, great wifi, and has everything you need for a few days or week staying in Rio.
Perfect location between Ipanema and Copacabana beaches, and a great supermarket directly across the street.
Taxi stand also right outside and 5/10 mins walk to general osario metro station.
All communication with Karina beforehand and during our visit was very good, very quick to respond to any questions we had, and provided us with a really useful set of tips and recommendations of restaurants and bars. (Many of which we went to!!!!)
Would definitely stay again when back in Rio and happily recommend to friends.