We were very happy with our stay at the Airbnb. Marcelo and Mischa were always helpful and responsive and we liked the flexibility and easiness to handle everything. The space was big enough for us (3 guests) and we were able to walk / catch a taxi easily to any spot we wanted. The 24/7 concierge is also very nice.
The only downside was that it was carnival and everything was being booked out so we were happy to get such a nice place, however, considering what Rio normally costs all accommodations during that season are overpriced (demand > supply).