A private suite on a quiet street, just steps from good food (try Noodle Barn!), and a few blocks from the Green Street T. Kelly's place is even better than described.
The shared access is just a matter of the front door and a single staircase.
Kelly and Phil met us on arrival, and helped us with our luggage, then we were up in our own spacious, 2-bedroom suite with kitchenette. Each kid had their own bed and we got our own lovely room.
I had the sense that we could contact Kelly and Phil whenever we needed, but overall we did not interact. They were exceedingly gracious hosts -- providing so many thoughtful little touches -- cream for coffee already in the fridge, fluffy towels, a selection of local guide books and dining recommendations.
It was the perfect home base for visiting colleges in Cambridge and seeing historic Boston. Stay here if you get the chance!