First off, the neighborhood is one of the nicest in RI, which is saying a lot. Parking is in their small driveway, but not a problem even with my big pickup.
The room itself is, as others noted, technically in the basement, but not really musty at all; they even have a newer dehumidifier here. There's lots of homey knicknacks around, closet space, a little kitchenette, fridge, standing shower, big mirror in the bathroom. The bed is rather small; you won't be staying here with someone else no matter how well you like each other. It was very quiet after about 8:30pm, except for the occasional cats playing with toys on the floor above (not really that loud). And I had a nice chat with the host's son as we were leaving. All in all, a good experience, and very reasonably priced.