Sarah's house is ideally located next to the Charles river and walking distance from Harvard Square (20 min, about). We visited with our 9 month old daughter and enjoyed taking her to the two small parks that are located within a block or so of the house. We also enjoyed walking to Mt Auburn Cemetery and Fresh Pond (and nearby amazing bakery "La Saison"). I took advantage of the BlueBikes parked across the street to bike into my office in Harvard Square -- Cambridge is very bicycle friendly. The neighborhood is mostly residential but there is a cafe (Darwin's) about a 10 minute walk away. Easy to get delivery from local restaurants and cafes as well.
The house is a spacious older build that was remodeled a little while ago to have modern features like central air/heat. So, it is really comfortable and pleasant to live in. This house is "someone's house" as opposed to "a property managed by a company that specialized in AirBnB." I think this distinction manifests in the following way -- some of the appliances / features are a bit dated but, on the other hand, the house is stocked with lots of extras that come in handy. For example, our daughter got sick at some point and there is a humidifier. The kitchen has all the spices/oils/pots/pans you might ever need. Sarah is super responsive to any questions or problems you might have.
We had a great time and I would recommend Sarah's house to anyone looking to stay in Cambridge!!