I was in Sao Paulo last year for a business conference (sorry it took me so long to write my review) and felt totally intimidated by the size of the city and concerns about safety. I stumbled on Rent a Local Friend on trip advisor and decided what the heck, why not? I got Nathalia as my guide and she was just terrific! Friendly, knowledgeable, perfectly fluent in English, and just a really nice person to spend the day with. She really put a lot of thought into showing me things I would be interested in (like architecture), and took us to a little neighborhood place for a real Sao Paulo buffet lunch, just like the locals do. If you are going to S.P., definitely give RALF a try and ask for Nat!