The apartments description is very honest and fair. It is truly a lovely, very clean and spacious place. The arrival and introduction to the place was very personal, so we had the advantage of speaking Spanish (so not Portuguese) and could follow everything. Communication with the host and the local person was fine, so little required. There is good space for 6 person, more entertainment units than one would every required.
One thing to remember is that Rio is a noisy place and yes for the ground floor place one hears street noise. There are also buses sometimes idling, but that is part of Rio. Great restaurant and shopping available so short times for shopping only on Sunday.
There is a great bike rental place about 1 block away and to take a taxi to the Pao de Azucar and other points of interest is easy. For this the location in the Copacabana is great. Internet worked well, so it is on cable and if to many users start playing online or watching movies (evenings) it is getting slow so this is beyond the control of the host. High recommendation for this apartment. Excellent value instead of 2 or more hotel rooms.