The apartment is really cool, great location (only 2 blocks from the metro and the beach) and very quiet though right on busy Rua Visconde de Pirajá. The hosts were very helpful and fair regarding some special wishes I requested.
The keys were left with the doorman on my arrival and departure, which was no problem at all.
I would definately recommend this place to anybody who prefers staying at a private apartment rather than in a hotel. And I will try to book it again, next time I return to Rio!