Another option to get into the city is ground transportation. A special bus service (
http://www.airportbusservice.com.br) offers numerous routes around the town, like Paulista Avenue, Downtown and Tatuapé, check where you are staying or going. Rates are BRL24. These buses run from 7 am until 7 pm, and the ride to and from the airport should last about 30-50 minutes.
For low budget travellers, there is a public ground transportation, a bus going to Tatuapé (East Zone), where you can get local subway (Red line, transfer at Sé Station to Green and Blue line). If it's the first time visiting the city, be sure to get information at forum before reaching airport. São Paulo is quite a huge city and easy to get lost.
Taxi
Why bother when there is such a nice reasonable air conditioned roomy bus conveniently available a few steps from the Hotel front door for US$12.00 to or from the airport ! ^
Also, you must be careful to take official taxis for security reasons and at times avoid a bumpy ride in a tight back seat wiith bad shocks.
Can not say it any better the second time.
I take the modern Airport bus that stops right in front of the Ren.
The bellman will even attempt to come to take your luggage at the bus stop.
I see no need to worry about taking a Taxi or Hotel car at any price unless it makes you feel exclusive or want to hit the boss up with costs!