Our stay at Marc's place was great! The place was clean and very big. It has all you need for long term stays: plenty of storage space, a laundry machine you can use, very comfortable beds. Although there's no kitchen, there are enough appliances to prepare/reheat food (microwave, toaster oven, egg cooker, coffee maker, etc). You have your own entrance so all the privacy you want. Marc is a great host; nice to chat with but also respects your privacy. Easy to get in touch with through text/phone.
The location of the apartment is a little more outside of the city, but with a short bike or bus ride you are in Cambridge, Brookline, Allston or even downtown Boston. Brighton itself has some nice restaurants and coffee shops as well within walking distance.
Definitely recommend staying here!