I enjoyed staying at Mario's very much. The room I rented (it was the small one) was exactly as it is on the pictures. The location could not be better: one block from posto 5 in Copacabana and within walking distance to Ipanima. The subway is 2 or 3 blocks away and all buses stop almost across from the building. It is easy to shop (supermarket is literally next door) and there are a number of decent restaurants close by. I also socialized quite a bit with the guy who rented the other room (Hi Alex!!!). Mario was very gracious and he answered all of our questions about the city and where to find things. We had very lively conversations and my experience was extremely positive.