What a great location!!! Boston is my favorite city in the U.S. (I live there for 20 years), the Back Bay is my favorite neighborhood, and this studio is on my favorite street. I feel lucky to have stayed there. This is a very quiet street. Very little traffic. You step outside, and it's like you are in an upscale urban 19th century London neighborhood. (Well, ok, except for all the parked cars haha.) You hear birds. You are surrounded by trees. And these charming townhouses. Old but well kept up. You are a very short walk to the Charles River, shopping, and public transportation. I recommend walking the Commonwealth Avenue Mall (they call it a "Mall" - it's just an exceptionally beautiful median strip) to the Public Gardens.
The studio itself has high ceilings, bay windows, a decorative fireplace, and a certain old world charm.
Michelle was an excellent hostess. I had a few problems - with cable TV, with wifi, and with the stovetop - but she addressed them promptly. She even had a brand new stovetop installed.
One more recommendation: Check out the very good bike sharing system, called "BlueBikes", and pedal around the Charles.