On the plus side....
:: The location is excellent - I had not appreciated how walkable Boston is, and this studio is right in the middle of everything I needed to do (Hynes convention centre, medical campuses, tourism).
:: It is easily a big enough space for 2 people
:: It was clean and tidy
However...
:: the studio is on a moderately busy road and although most of the windows are double glazed and well sound-proofed, the window with the AC in it lets in a LOT of noise. Expect to be woken through your ear plugs.
:: there are no curtains (just translucent privacy blinds) so you are at the mercy of natural and night-time light - makes it very hard to adjust time zones
:: the studio is not as chic as the photos make out. They are accurate in themselves, but just don't give the full impression which includes very basic carpet, cheap furniture and rust stained ceiling. I was disappointed on arrival.
:: the whole building (including the studio) has an old smell - I admit this is subjective, but I found it unpleasant. It was easily remedied by leaving the windows open
:: the promised washing machine was out of service (and looks as though it has been for a while) - but without this I wouldn't've been directed (by the helpful Maverick staff) to the truly excellent South End Laundry at 565 Columbus (who will wash / dry / fold your washing, 10 pounds (weight) for $15
:: it is not cheap (but then nothing is in Boston).
Overall this is adequate but I would hope to find something better when I return to Boston.