Great flat with plenty of old school character and in a great location; a short walk from back bay station if arriving by train and close to the conference centre, shops and restaurants. Boston commons and the more historic centre is about 10 to 15 minutes walk.
Only downside can be the noise - 'Lolita Cocina and Bar' is underneath the flat and whilst you cant hear the bar the queue for it starts under your bedroom window. Can get noisy on Fri/Sat nights with ~10 people queuing up under your bedroom window, no issues Sunday to Thursday.