We really enjoyed staying at Eumir's place in Copacabana. It is very well located, in a 1-minute walk you will be able to get to one of the most famous beaches in the world.
The apartment is well equipped and very clean, it has an ideal size if you're going as a single person or as a couple (which was my case). The building is very safe, with a 24/7 guard who is responsible for letting people in.
Finally, Eumir was a very nice host, always providing prompt responses and giving us valuable tips when we checked-in.
We really appreciated our stay in Rio, and the place we stayed was considerably relevant for that. Thank you!