Meh
We were underwhelmed by the enVision for many reasons. The neighborhood lacks appeal and there is little by way of close-by shopping or dining. We wanted to pick up a bottle of wine and the closest spot was a icky little store a ten-minute walk away that didn't even accept credit cards.
We were put in a first floor double even though I spent an extra $20 or so for a "park view" room, but the park could only be viewed if you stuck your head out the window and craned your neck in one direction. The actual view was the side of a building across an alley. Speaking of which, the window actually fell off its track when we opened it, falling inward on my head.
The rooms and hallways had a distinct chemical smell -- perhaps because the hotel and carpets are new, or perhaps cleaning solution?
Pros: The beds are comfortable with quality linens, there are plenty of outlets, a real closet with a bathrobe/slippers, bathrooms a decent size with nice, fluffy towels, an iphone-compatible clock radio/charger, and decent room-darkening curtains.
Cons: In addition to the small gripes listed earlier, the walk to Fenway was longer than anticipated and a little rough in places; the small cafe/snack room does not sell alcohol; wifi, while free, was very spotty; the walls are thin and rooms are noisy. We were near the elevator and heard its door chime every time it opened as if it were right in the room. Plastic (not glass) cups. 
Tips: Don't spring the $18 for valet parking - there is plenty of street parking, and we had no problem parking in the alley right next door to the hotel.