The house is located in a wonderful condo and all the people working there were always very nice and helpful. We were 4 volunteers for the Olympics, all working in different places in Barra da Tijuca and nobody had any problem to get to work: the brt station is very close (less than 10 minutes by walk) and it will get you everywhere, including to the new line of the subway or the main shopping centre in Barra. The neighborhood is very quiet and safe even at night, there's a taxi stop nearby, few markets and other shops and restaurants right behind the house. The beach of Barra and Recreio are wonderful, often less crowded than Copacaban and Ipanema and perfect for surfing.
At first the apartment itself may seem small for 4 people but it's actually perfect: common areas such as the kitchen, the living room and the balcony are comfortable even when friends come over for dinner, nothing was missing. We kinda had some problems with the hot water (nothing serious though: the boiler just needed to be regulated and I'm not that good with those things to try it myself), but the owner and his daughter are very nice, polite, welcoming and efficient and solved the problem very quickly, always answered straight away when I had something to ask.
For the Olympics it worked great and, even if by subway or by car the center is still a bit far, I would suggest this place and its wonderful hosts to anybody :)