It is a great location- we were able to walk or take the T to anywhere we wanted to go in the Boston area. Because it is down town be aware that it is loud- even with windows closed.
Also- the unit may be non-smoking but the heating and cooling system seems to be building wide and if someone is smoking, the smoke is distributed through the system. Also, there is an organization across the street from the building that has a number of people who are outside smoking. They are all very polite but you can't open the windows if you are sensitive to smoke.
The apartment is VERY basic. It is clean, it has dishes, soap, etc. but it is in no way personalized or luxurious.