Stay elsewhere
We stayed here for 2 nights as part of our honeymoon. Overall I was extremely disappointed and would recommend people to look elsewhere. We paid $250 a night plus $40 a day for parking. Yes, Boston is expensive but I refuse to believe that DoubleTree is good value. We stayed in a very average room with a very dated bathroom (it had a drop-down ceiling). Yes they give you a cookie when you check in, but then you have to pay for internet! I was in disbelief when I discovered that. I have travelled extensively throughout North America and Europe and I have not stayed in a hotel that made you pay for internet in a long long LONG time. Especially when you are paying $250 a night! Lose the free cookie, and offer your guests free wii-fi. The only thing the hotel had going for it was the location which is in wallking distance to everything. 
Overall it was a disappointment and I imagine there are much nicer hotels in Boston for the same value.