Martin's place was fantastic, I would definitely stay there again. The place was easy to access with entry codes. we parked at the outdoor Dorcester lot, which was only a couple of blocks away and $18/day. the space was clean and well equipped. the shower was amazing - products and towels available, great shower head, and hot water. the kitchen was well equipped with glasses, hot water kettle and Keurig maching, fridge and microwave. the bed was super comfortable and large, and the pull out couch was great for my teenage daughter (not huge, but definitely not the least comfortable pullout we've experienced. there is NO privacy between the bed and couch, other than a cube bookcase, so if you're two adult couples, be aware of that.
the lofts are located near some great bakeries and restaurants, and it's also only a 20 minute walk to the touristy parts of Old City (and there are busses, but we never tried those).
Martin provided a book of suggestions & hints, and he was very responsive.