My sister and I stayed for 2 nights at Carlos's place.

The location is amazing and safe (there is a doorman at the entrance 24/7), everything is within walking distance, and there is a great cafe next door where you can get a big mug of cappuccino (trust us - it is really hard to find in Brazil).
It was very easy to find the apartment when we arrived.
The apartment is beautiful, well decorated and furnished. It is big and spacious. The beds are comfortable.
As for Carlos- he was a very helpful host, had great suggestions and answered all of my questions very fast.

Bottom line: good value for money- you can't get this space and chic in this location for less.