Host: Eduardo went above and beyond as a host. He answered questions very quickly and was very helpful. He also helped out with getting a Brazilian SIM-card and accompanied me to a nearby mall to help with the whole process, making it very easy and fast. Without that help, it probably would have taken a lot longer. He also gave a lot of tips on where to go and what to watch out for in Rio, which was really helpful.
Apartment: just like in the pics. Very clean and stocked with all kinds of useful home stuff, like soap, detergent, etc, etc. It's big enough for 2-3 people. It's also in an amazing location: right next to a metro station, next to a lively area with tons of bars/restaurants, a few minutes from the beach. It's also in the center between Leblon/Ipanema/Copacabana, so it's easy to see a lot of the best sights. Despite that, it doesn't get too loud at night. The area is pretty safe and a great base to explore and enjoy Rio. There's also a doorman.
Great choice!