Sophisticated and cozy
Simply put, this is a sophisticated hotel in a great location with a wonderful staff. We stayed in a Beacon Hill Studio on the ninth floor, and it was fabulous. I admit to being a sheet snob, and very rarely do hotel sheets measure up for me, but theirs did. The fireplace and surround sound stereo added to the cozy and romantic atmosphere of the room. (There are controls for both next to the bed.) The marble bathroom with rain shower head was also very nice. 
We were very pleased with our stay at XV Beacon and highly recommend it.