Isabel's third floor place was fantastic for our needs. Very clean, good A/C, and many thoughtful touches to make practical use of the space. The kitchenette with refrigerator/freezer, washer/dryer setup, and cold filtered water also were greatly appreciated . The space was nice for relaxing, and also, well set up for a work space for a solo traveler. We knew going in that the space had some steep stairs to access and that the shower ceiling is sloped (fine for us at 5'10" height, perhaps not for someone over 6'; but Isabel did offer use of a shower on the second floor if the third floor one did not work out). On top of it all, Isabel generously offered us fruit as a snack one afternoon. For how close it is to Central Cambridge, it was also very quiet and peaceful as advertised!
For those with expeditious travel within the Boston/Cambridge/Somerville/Medford area, the location is even better than appears on the map. It is only 15 mins (easy) walk, with luggage, from the Central Sq. Red Line T (I made it in 11'30" fast-walking once). It was 10 mins walk to Inman Sq, and to a number of Mass Transit Blue Bikes stations for inexpensive hire by the hour or day. Using the T, we easily reached destinations in <40 mins of total travel (walk + T) as far as Porter/Davis Sq. and downtown Boston, and you could reach Harvard or MIT in ~20-25 mins easily. There are a number of grocery stores in Central and Inman Sq, including a Whole Foods less than 2 blocks away. For the evenings there are also a number of great local brewpubs within 6-7 blocks walking distance (e.g. Lamplighter Brewery).
Overall, we give highest recommendations for Isabel's place for 1-2 travelers on a weekend-to-weeks long stay. Highest compliments and thanks to Isabel!