We stayed at Bill's house for three days in the beginning of August.
Our stay was very comfortable and enjoyable. The house is in a good safe neighborhood with an easy access to two subway stations (around 10 minutes walk). Bill has a big backyard where we parked our car - huge advantage in Boston.
The rooms and bathrooms were clean, organized and located in a way to ensure privacy. There was a wide variety of healthy food and drinks to choose from for breakfast and Bill himself always offered helpful advice in regards to visiting the city.
He also gave us blankets and chairs to take with us to Ogunquit Beach in Maine and an EZ-Pass to help avoid long traffic lines on the way there.
In conclusion, it was a very pleasant stay and Bill is a wonderful host.