Nice place, but has some problems
We stayed here for 2 nights in July; spent a day sightseeing in Boston, then flew home the next morning. The room was clean and comfortable with a view of the airport (opted not to pay extra for harbor view). The front desk staff, concierge and bellmen were great.
The downsides:
Shuttle service - some of the drivers seem to have a real attitude problem (driving by us without stopping, after requesting pick up; arguing loudly over their radio) while others were friendly and helpful. Usual wait for shuttle was 20-30 minutes.
Food - room service was SLOW (45-60 min), then one plate was forgotten, which took another 30 minutes. Food was mediocre at best, certainly not worth the price. Delivery person was very friendly, though. Tried to eat breakfast at the hotel but it was a 30-40 minute wait (!), so we opted to eat in town.
Did not use fitness facilitiies. Tried to print out boarding passes but the computer terminal for doing so was not working. $12.95 per device, per day, is unreasonablly high for internet access, in my estimation. Having the water taxi right next to the hotel is convenient, but a pricey alternative to get into town.
Was not bothered by any airport noise, but was woken up by other guests (early risers), as well as housekeeping knocking on nearby doors.
The Hyatt is fine, but if I need to stay at the Boston airport again, I'll try someplace else.