I've stayed at the Waltham, MA property twice since the Double Stay program began. Both times, I received an upgrade to a 2-bedroom suite. When I checked in last week, the guy checking in next to me also got the same upgrade - makes you wonder how many 2-bedroom suites they have!
I was impressed with the afternoon snacks on offer - about 4-5 different things, including two soups.
I agree on the location. There is a decent (slightly overpriced) Cuban-inspired seafood chain pretty much across the street. It's called Naked Fish and is pretty good.