The Mercure Sao Paulo Pamplona is a great option for a stay of multiple days. The rooms/appartments are big and have the sink seperated from the rest of the bathroom. The rooms were very clean, and the AC was quiet (a relief from some other places in Brazil). The pool on the roof is small, but does the trick. During our stay there was constantly a person at the desk that spoke English and they were very helpful (but not always too fast). I cannot comment on the breakfast, as it was not included in our room rate. However, the bakery/breakfast place on the corner of the next block toward av. Paulista is great.

The area of the hotel is great as it is close to Av. Paulista en has some good restaurants in the area. I must disagree with one of the previous reviews that said that one gets easily winded due to the hill. If you are used to walking, you will have no problem walking up this hill either. This area of Sao Paulo is comparable to San Francisco.

All in all a great stay for us. I booked this for about $100 for two persons per night (excluding breakfast) (via Orbitz) which it was definitely worth. However, they normally list the rooms for R$649 per night (about $300), which would definitely change my value assessment.

It's really a great choice in the rich area of Jardim Paulista. Close to Paulista avenue - yes, you gotta walk uphill, but it's just a couple of blocks - and the pretty trendy streets of Oscar Freire and Augusta, if you stay here you'll be able to go on foot to great restaurants and theaters.
Ok, the hotel doesn't have couches or armchairs for you to chill at the reception, but who cares? All receptionists have been very quick and polite so I could get to the room faster. And surprise: it's awesome. Huge and new bed, a great study /work area, a cute armchair for me to read my book peacefully, 32' LCD TV set with cable, a fair bathroom and a nice bathroom detached grooming area in case you're with your wife and wanna get dressed at the same time.
Free wi-fi at the room - never failed, at least on my smartphone.
In short: I really don't get it why people always complain about everything, 'cause I haven't seen any of the problems some people mentioned here.
Maybe I'm just lucky :))
It's a keeper, definitely.

The good:
This hotel is in a perfect location close to Paulista. |Even though it's a busy area, this hotel was silent. Even on a Saturday night.
There are plenty of inexpensive options to eat near by. Try the amazing bakery up the street.
The room we were in was very big. It's hard to find a king bed but this place had it and it was comfortable!
Nice big desk in the room to work at.
Very clean.
Air conditining worked well and wasn't too noisy.
Nice front desk staff.
Free internet, WiFi and wired.

The bad:
There's a pretty steep hill to walk up to get to Av. Paulista. Walk too fast and you'll get winded easily.
They took our towels every day and replaced with only one towel several times. We had to ask them to bring another up each time.
They missed our wake up call one morning.

So that's about it. Not a lot of bad. I've read some reviews about the breakfast being bad and expensive. We never tried it. The bakery up the street has seating and is cheap.

The location and facilities of this hotel is good for the price. There are many restaurants in the area, and the hotel is a short, uphill walk to shopping. The service at the hotel is fair as well and could be better. The internet service is very poor, which for a business traveler these days is akin to death. The solution is the Ofner coffee shop which is a block away. Decent internet and very good coffee/espresso. Thumbs sideways for this stay. Will likely stay there again unless I can get a better deal.