Really chic hotel with some glaring flaws
Truly a hotel of trade-offs:
-Amazingly beautiful rooms but in a terrible back alley
-Very big flat screen, every movie costs an arm and a leg
-Really nice bar, rarely open, never busy
-Great treadmills, no weights
It's a good hotel, but man is it ever expensive. At $350 a night I expect more than a shady neighbourhood next to a shady bar, next to a shady club next to a shady Dominos pizza. 
Upon first getting to Boston the cab driver had no clue where the hotel was (other cab drivers would have a similar problem). We get there and it is obvious it is a renovated hole in the wall, possibly looking to the future praying for gentrification. The meet and greet wasn't rude, or even unprofessional, but I knew something was off when the receptionist said "Hello and welcome to the Onyx Boston, weareherealladaythebarisopenmondaystofriday3:00to12:00saturdaysandsundays12:00to10:00iyouhaveanyquestions..." The door man was also off sometimes, he looked like he hated his life and was hungover to boot. One night I walked in and the concierge was sleeping LOL! It's like 4 stoners got together with a business idea. It's also just barely walking distance from everything, just close enough to brag that it is walking distance, but not close enough to actually considered walking places. 
If this hotel was $250 a night, I would consider it again, but at over $300 no thank you