The room was just as shown and hosts were very nice and always checked to see if I needed anything. Although nothing ever happened to me, I didn't feel comfortable barely going out of the front door after dark. I did walk to the train station (17 minutes away) to and from school, but would always Uber back if it was even threatening darkness.
Do be aware this is not the average Air B&B. You are expected to clean up after yourself including the shared bathrooms, so don't expect your average hotel cleaning treatment. In addition, you are living with others. When I was there, the pair in the room next to me screamed at each other around 8am some mornings. The arguments were so scary I once missed class because I was too afraid to leave my room.
Overall, the hosts were great, just be prepared as you will be staying in Dorchester, which is not the greatest area and will be living with whoever else may be there!