Rents are insane, food isn't too bad and utilities are cheap.
Traffic is atrocious, so you'll want to live as close to work as possible. The city is a construction zone. Inflation is running above 10 percent and if they get the 2016 Olympics (decided in 192 days) everything will only get worse. Schools for Ex-Pats are available, I don't know the costs but I do know they are very full, some with waiting lists.

All that said I still like it here.