In general, it is a good place. Jhon reacts quickly to messages. Moreover, he chooses friendly guests. I have met nice and friendly people. The location is also excellent. If one has an event at MIT or Harvard, it is a perfect place. One can take public transportation or walk. Furthermore, there is a nice bar where one can have fun.
On the downside, it could be loud since the apartment is located close to the main street. Hence, you better wake up early in the morning (08:00 or early Is good). I also believe that there is room to improve in the lavatory area.