My place is close to Citibank Hall, Shopping Downtown, Outback, Starbucks and the beaches of Barra da Tijuca. You will stay in a comfortable and safe place in a condominium of houses near the beaches.
I had a great stay! Gilberto and Vitoria were awesome hosts, they were very helpful and responsive to any questions or concerns I had and helped me with my questions even before I arrived (e.g. what was the best way to get to their place from the airport, currency exchange, getting a Brazil SIM card, etc.). The space is excellent for the price - it's large, private and comfortable. It has its own door/access and there is a separate kitchen and small dining area from the bedroom and both are completely separate from the rest of the house. It has pretty much everything you would need for an extended stay (air conditioner, washing machine, closet, fridge, microwave, WiFi, huge flat screen TV, etc). One point to note is that this space is on the 2nd floor accessed by an external metal spiral staircase so if you have really big and heavy luggage, I would reach out to check before booking. The house is in Barra da Tijuca and is within walking distance of the beach, bank, public transport and food. It's a 10 min walk to the beach, and 5 min walk to a BRT as well as a regular bus stop, McDonald's, pharmacy, and Citibank branch. There is a nice buffet place further away (10 min walk) as well as gas station. There are some really nice upscale malls near by as well (e.g. Village Mall is 10 mins by car straight down the road). It's a pretty safe area - you need to go through a security checkpoint to get to the house. I was there for the Olympics so it was a great location for me since the Olympic park was in Barra but it is a ways from the touristy parts of Rio (e.g. Ipanema, Copacabana, Botafogo, Centro). However it's relatively straightforward to use public transport (the closest metro station is 10 mins away by car/bus, which will take you to the other parts of Rio). For reference, it's about 35 mins and ~USD $10 by Uber from the house (I usually catch it outside the security checkpoint) to Ipanema in non-rush hour traffic.