Preface: This was my first Airbnb experience and I suspect it was a bit of an unorthodox situation compared to what most folks do. My wife, two small children, and I stayed at Greg's for two months while we searched for and ultimately purchased a home.
Greg has done a nice job with the place. It's comfortable and big enough for a small group to hang out in; while the kitchen is appointed well enough with the essentials that you'll be able to prepare most meals for yourself and up to a small group with ease. Having two young kids we don't eat out that often, so it was nice to be able to cook as if we were in our own place.
From a location perspective you're in close proximity to most major attractions in Boston and you've got access to the B, C, and D Green "T" lines, which makes for a nice set of options when you want to take public transportation. And If you're a runner, you're in a great spot with some challenging hills to tackle along with the infamous "Heartbreak Hill" nearby.
I found Greg to be responsive and willing to answer all your questions; I particularly appreciated that he'd check in periodically to make sure that things were going well during our stay.
If you're in town for the weekend or even in Boston for a week or two for work, then Greg's place is definitely worth checking out.