Adler was a great host, very friendly and promptly responding to our questions both before and during our stay. Everything was clean and in order. There's lots of space here for the money. It was great to have a completely separate bedroom for our teenage daughter rather than resorting to a fold-out sofa in the same room with us -- all of us appreciated that. The kitchen was well-stocked with equipment (and also spacious). There are some extra small appliances down in the cupboards, like the toaster oven that toasted our daughter's bagels perfectly in the morning.
I would rate our stay with 5 stars, except that the air conditioning is set very cold (for us) and there was no way to control it. We closed vents, but that only kept the cold air from blowing directly on us. Adler was apologetic when I asked whether it could be adjusted -- it's on a smart meter for the whole house, and perhaps setting it to a higher temperature would make it uncomfortable upstairs. It made our first night unbearable for one of us. When we saw Adler in the morning, he pointed us to one of the cleaning closets (labeled as something not for guests to explore -- perhaps we should have been more adventurous the first night) where we could find an extra comforter, and that made the second night much better.
The location is actually better than it appears on the map. Coming from NYC, Boston feels like a small town, so using the T to get around meant everything (including Cambridge) was about 20-40 minutes away (you have to go downtown to switch lines). But if the weather's good, it's only about a 20 minute walk to places like the Isabella Stewart Gardner Museum, the Museum of Fine Arts, and the Fenway. The neighborhood is quiet and pleasant. Neighbors said "hello" to us as we walked back from the subway station.
In sum, this is a great place to stay for the money in Boston. Just be warned: if you can't tolerate cold air conditioning, it might not be for you.