Negatives: This is a nice Westin property but with some service issues. As mentioned in other reviews, the staff - from front desk, to breakfast room to spa employees - seem to have an attitude. This property is outside the city center so you must take a subway if you want to see the sights.
Positives: The pool is amazing. It has a wave resistance (not sure of the correct name) that can be turned on. You can get a float and the current moves you in a circle around the pool with no effort on your part. Or you can walk against the current for a great workout. They do not always have the water motion turned on. Some times part is turned on, sometimes none, and sometimes all. I did not figure out a pattern of when and, as mentioned above, found rude unhelpful staff when I tried to ask. But the pool area was amazing. Wonderful place to relax even if you were not in the pool. The breakfast in the executive lounge was quite good.