We stayed at this apartment during our honeymoon, and it was absolutely perfect as a base to explore Boston from. Cambridge is a lovely area, with easy access to the centre of the city or a short walk up to the Harvard area.
There were plenty of nice touches in the apartment, drinks in the fridge, netflix available, and really good recommendations for restaurants and cafes (definitely take their recommendation of Casa Portugal, which was great for dinner).
They were really responsive hosts, answering any questions really quickly.
Overall, we had a brilliant stay - thanks very much!