I was looking for a quiet place with enough privacy. And that is what I got.
The place is directly across the bus/subway station. This is good for getting into the inner city with the Redline subway.
Manuela was very nice, welcomed me, provided me with a tourist guide (in German!) and explained everything about her place and the Boston area.
The other AirBnB guests were very quiet. Of course I could hear them sometimes, but that would have been worse in a hotel.
If I visit Boston again, I'll sure check if her place is available!