What is the best area in Sao Paulo to stay?

Hello, I'm going to Sao Paulo in July and I am looking for a hotel in a safe area. Most important is that it is nearby public transport and that it is clean. My buget is about US$60-US$80 per night.
What are good areas/ neighboorhoods to stay?
And does anybody have recomendations for a hotel?

Thanx in advance!

In my opinion, as far away from it as possible.

The best area to stay is near to Avenida Paulista or Berrini or Faria Lima/Morumbi/Na莽玫es Unidas - anyone of these places are very good!
I suggest the blue tree towers hotel
http://www.bluetree.com.br/home/home.asp...

Blue Tree Paulista the rate is around 90 dolares per night but worth every penny! best breakfast ever, and they have a hot pool - amazing! I love to stay there!! and you have very good restaurants near by (like SPOT) and shoppings around!

Stay in Av. Paulista Area...there are plenty of public transport and it麓s safe and clean (financial district)
The Ibis Hotel (Accor chain) is nice and clean and around US$60 and US$80 per night.

I live near MASP (Museum of Art of S茫o Paulo) and I recommend: Stay at Av Paulista area! (Jardins or Cerqueira C茅sar) It's the best place in the city to dinner out, to walk and it's very easy to catch a public transport like subway.
Instead Berrini or Faria Lima/Morumbi/Na莽玫es Unidas, that doesn't have subway nearby at laest 4 ou 3 miles..Trust me!

I lived in the Caixingui/Morumbi area for a while - though that is away from the centro and a bit pricy. When I returned, I stayed in the Centro - it has access to all the metro lines, Avenida Paulista, museums, shopping, restaurants, bus lines. I stayed at the Hilton and paid around $100 p/night. There are other hotels near the centro area that run cheaper.

I might suggest contacting a travel agent and have them get you some info - it was very helpful when I went.