We stayed in the flat during the worldcup. All I can say, is that we had a great stay in a perfect location.
All communication upfront happend very easily. Monica is very responsive too.
Due to delays with our flight, we arrived only at 2am. Monica waited for us, so we could get in.
The appartment is modern and very clean. We had all we needed. Monica provided towels too. You have airco and wifi which works well.
Finally, the location is great: less than 5 minutes walking from both Copacabana and Ipanema beaches. And you have a metro station and city bikes just in front.
So a great recommendation if you go Rio!