My stay at Gema's place was excellent. I went to Boston for a week on a business trip and stayed at Gema's house. I really felt like at home. Gema and her daughter Marina made me feel very comfortable. They are kind and warm, and we would always have a chat at nights and mornings, just before going to the office. She has an awesome coffee machine, btw.
The house and neighbourhood are very quiet, I slept very good there.
Location is perfect. Just a short walk to the T line (metro) and 20 minutes to the centre. Some days I walked from and to the centre, as it only would take 40 minutes. You are also very close to the main Cambridge attractions, like Harvard and the MIT.
This has been a great experience to me and I appreciate how they made me feel like at home.
If you are traveling to Boston and looking for a shared room, Gema's house is the place to stay.