Contact with M&C was fast and easy, and they were kind to provide a lot of good information before we arrived.
The apartment is very nice, especially the balcony with the wonderful view to the mountain and the 2 rooms facing this way. the sounds in the night were almost like a jungle, even though you are in the middle of a big city - amazing.
the last room is facing the other way, and is not as breezy as the others, so if you are 3 people sharing the apartment, maybe one will be a bit more unlucky than the other 2.
The doormen and neighbors we met, were all very kind.
I can highly recommend this place for anyone who wants to stay in copacabana.