Thank you Luxtrvlwrks. This sounds like a wonderful new addition to the Boston hotel scene!
For those who haven't been to the Four Seasons in a while, they have completely redone their bathrooms, putting in marble walk-in showers, and they will be completely redoing/greatly expanding their spa the first part of next year.
My current ranking:
1st: Four Seasons for Service, Bristol Lounge, Park Views/Location, and new Bathrooms
2nd: Mandarin Oriental for Spa and Shopping location
3rd: Ritz-Carlton for Sports Club LA Gym and Club Floor
4th: XV Beacon for Beacon Hill location, fireplaces in the room, and dining