Benjamin K.
Yelp
The most trendy and cool hotel in SP.
High-end, classy, large rooms, nice neighborhood. If you can afford it, a great choice.
As a foreigner, it will still have some of the imperfections of most Brazilian hotels, i.e. below average gym, some "lost-in-translation" with the staff and a tendency to overcharge for bottled water ;)
When in SP, if I want a cool rooftop, I stay at Hotel Unique, but for a more luxurious experience, Fasano is the best.