Jillians in Boston, directly behind Fenway park, is quite possible the most amazing Pool room I've ever been in...and I've been around...both coasts.
It's practically a cathedral built to honor the game, though I doubt it's the room in Boston where you'll find the most action (if that's what you're looking for).
http://jilliansboston.com/explore/jillians/
This website gives pretty detailed reviews of Boston area Billiard Clubs.
http://www.bostonpoolhalls.com/
Horrible, HORRIBLE tables. Bad pool atmosphere. I would definitely not go to jillians if you are "into" pool. Mazin's is a much better choice.
If you can stand a drive, I'd hit Snookers on Wednesday night. They have an awesome tourney on wednesdays for $20. Starts at 6:30. Its about an hour out of boston though, maybe 50 minutes.
Going north, Grand China has a good tourney on Thursday and Friday. The Friday one is bit more serious, but both are on the "fun" side of the spectrum...$10 entry. Nice 8.5' Brunswick tables that play great. Grand China is in Salem, NH right off exit 1 of RT 93
Hope this helps.
KMRUNOUT
Edit: That picture looks nothing like the Jillians in Boston. The Boston one has more of a night club feel to it, rather than a pool hall. And the tabels have disgusting red shag carpet for cloth. Yes, I said RED haha.