Hi !
3 friends and I stayed 6 nights in Ana's flat. And we all are VERY very happy about it.
Flat : very clean, big, modern furnished, very comfortable bed (also the sofa), very hot showers, ... And there is a guard 24 hours.
Location : very close from the tube (1 min) and the beach (5 min)
On top of that, Ana has been the nicest host we ever had !! She gives very good advises, and is always available for her guests.
I highly recommend Ana's flat for your stay in Rio. You wont be disappointed !
François