Terrible at managing problems
I stayed here over St. Patricks day weekend, a Saturday into a Sunday. The main reason I was staying at this hotel was because we wanted to go to the parade on Sunday, and wake up close and not have to fight traffic. Sunday we were to check out, go to the parade, and then check into another hotel to then continue touring Boston. The majority of my bad review is due to the properties lack of ability to managing problems in the hotel. I understand that I checked into this hotel on St. Patricks day (read: party) weekend, but this is no reason for me to expect that parties would be allowed in guest rooms. I stayed on the 9th floor, and down the hall maybe two doors was a significant party happening. People in and out of the room all night, into 5am. Very loud. Called down to front desk to explain the problem, to be told that they would take care of the situation. This was certainly not something they took care of. Neither of us slept very much all night, making the parade something neither of us wanted to do in the morning. Because of this, we skipped it and continued to our next destination for sleep, even though the parade was the reason we stayed at this hotel. You check into a hotel like The W in an effort to get a good nights sleep. It's an upscale hotel, not a Motel 6, you expect more from them in terms on responsiveness to problems. 
Additionally, the bathroom set up is a mess. I've stayed in plenty of hotels with "open concept" bathrooms, but this hotel really misses the mark. There is no way to turn on the light in the closed toilet without turning on a light that is visible from the bedroom area. This means when someone gets up to use the restroom in the middle of the night, they virtually have to turn on a light in the bedroom to do so. 
If sleep is important to you, I'd think about looking elsewhere. Anyone can give you a good nights sleep when everything goes right, but when something goes wrong you want a hotel that takes care of the problems. W missed this mark.