I came to Cambridge for a medical course. I wanted a place that I could chill out in and because of the duration (5 days) didn't want the glitz or tedium of a hotel. Purnima and her place were a real hit.
An extremely kind, intelligent and thoughtful host, offering a clean and comfortable accommodation, with access to the kitchen, tea/coffee, etc. It was exactly what I was hoping for.
Location feels safe and most things of interest walkable and if this not to your taste, subway 10-15min walk away and taxis/uber never far away.
Highly recommended.