First time I ever used airbnb and I will be happy to both use it again and come back to Shawn's place when I'm back in Boston.
Even though we eventually didn't meet in person he kept me well informed about how to get there.
Cleanly, spacious room, clean bathroom, towels and he would also let me use his well equipped kitchen.

Good value for money considering what hostels and hotels cost in Boston, even if you're not downtown (7min by foot to metro station Jackson Square, 14 min on the orange line to Downtown Crossing).