Unfortunately, Roman had to relocate for work midway through the stay and so we were left without his valuable help for a big chunk of the trip. But he was excellent at the start and even picked me up from the airport!
The place was a bit small as he had to lock up one room to keep some of his items that he couldn't move out in time, but otherwise, it is furnished as advertised. Just maybe the hot water boiler could be better as there was only enough for one shower at a time (not gonna be a problem in the Brazilian summer I expect!)
The neighbourhood is quite suburban with a lot of families and felt very safe. However, public transport is a bit of an issue, but this should be fine by the 2016 Olympics as the subway to the city centre will be complete by then. Thanks again Roman!