We came to Boston from the west coast, and stayed at Hermina's place for three evenings.
We were uncertain in our arrival times and etc, but she was warm and welcoming, and gave us via text and email, all of the information we needed to arrive whenever.

The room was clean and quiet as was the bathroom. Its's safe, the Boston Police Headquarters is a block away. We used both a car as well as the T, and found both easy to manage.
There were not a lot of local breakfast, lunch-type places, but we did not spend much time in Dorchester anyway.
If you seek a simple, quiet, clean place to sleep, I think this is a good choice. Its not fancy, but it is quiet and comfortable.