I suggest you call Greg who runs two houses out on the blue line 4 stops from the airport in Reevre Beach. The places are on Campbell St, two blocks from the train station. Costs a buck to/from Logan.
Logans Crash Pad
no car needed
20 min to Logan
fully furnished house
You should also go and post your question to the "Crashpads" folder. It's the last one under the "Aviation Interviews Board" header.