I stayed here with my girlfriend for a weekend. The apartment is in a great location. Walking distance to Harvard Square, the red line, and many restaurants/bars. We went in late May and it was beautiful that time of year.
The room itself has everything that you'd need. There is a lot of natural light, a large bed, AC, water filter, etc. The bathroom and shower are shared (as described), and clean. The space had a very welcoming, comforting feel.
Hilary and her family are friendly and accommodating. They were able to make us feel welcome and give us a good level of privacy at the same time.
I would recommend staying here if you are in the area.