Cost of Living
One word: Expensive. This is mainly due to the high exchange rates. As a rule of thumb, you can expect to see the same numerical price for things in both places, but in Cambridge, those prices are in pounds, whereas in Boston they're in dollars. Because a pound is worth more than a dollar, things are more expensive in Cambridge than in Boston. You can expect to spend £5 - £10 for lunch and £10 - £20 for dinner at a restaurant.
Banking