Our group of six spent 2 nights at Vitor and Carlos' place in Rio. I would 100% recommend this place. It is large and comfortable and the location is unrivalled. The room I stayed in had a hammock (yay!). Both bedrooms have AC and the living areas do not, but there are large windows that let in a nice breeze and allow for good people-watching.
Be sure to check out the low key bar down the street where the musicians play at nighttime. The cafe across the street has great breakfasts and pasteis de nata.
Note that checkout is at noon sharp. If you need to leave your bags somewhere you can pay the doorman. We had about 10 bags and paid 75 rials for all, so definitely negotiate.
Vitor and Carlos are extremely friendly and accommodating. Don't hesitate to ask them anything!