Witt is a great host. His house is a one off and really interestingly furnished. It's not for anyone looking for a hotel style place to stay. But perfect for anyone wanting to stay in a real home with friendly locals.
It's 3 minutes from Shawmut metro station which takes you into the centre of town in 15/20 minutes.
Ask Witt about the Charlie Card, that gives you access to the metro and buses.