My wife and I are renting both a house and new guest house in Rio de Janeiro. I'm from the U.S. and she's from Rio. We also offer airport transfer/pick up and tours. We're located in the Santa Teresa neighborhood, the most laid back and bohemian part of Rio, close to all major tourist destinations and the beach!
Apart from renting rooms and the hostel / guest house, we run a volunteer agency. So if you would like to volunteer your time to make Rio a better place while you're here, we can help you find the position that's right for you -- from clearing trails in the Tijuca Forest, to working in an orphanage, to helping out at a ballet school in a favela, we have all sorts of job placements!