Not Worth It
I frequently travel to Boston and decided to use (waste) my Marriott points on a last second overnight stay. I was very disappointed in Marriott's offering. 
The positives were few but this is not completely negative:
Pros:
-Staff were excellent
-Location was good
Cons:
-Tiny Rooms
-Could hear neighbors clearly having regular conversation through walls
-Room was not arranged correctly; TV was on wall to the left of the bed (See Room 925)
-36 Dollars to park overnight across the street from the hotel.
Suggestion if you are travelling to Boston:Stay in Cambridge and take the 'T' Red Line into Park St.. The hotels are much nicer and cheaper there.