This Airbnb was fantastic. My son and three of his friends stayed here for their last two months of undergrad and had a great time.
The neighborhood is very safe and walkable. Porter and Davis Square are within walking distance, meaning there are lots of restaurants nearby. Trader Joe's, Whole Foods, Walmart, and an Indian store are also all within walking distance, among a number of other stores. There are also three T stops (Porter, Davis, Alewife) within walking distance, from which one can easily go to Harvard, MIT, Tufts, and Boston. (In all of this, "walking distance" means "within a 15-to-20-minute walk".)
The place was very spacious (especially the kitchen and living room), and it can fit four people very comfortably. Even this was primarily due to everyone's need to have their own room for Zoom calls. Otherwise, if you have any pairs of people willing to share a room and/or bed, it is very easy for even more than four people to comfortably live in this Airbnb.
The hosts were also very nice and accommodating, and the few times something in the Airbnb was broken, they were very quick to respond and fix the issue. They also furnished the Airbnb very well with small things like detergent, fabric softener sheets, many extra towels, toilet paper, coffee and tea, and spices. All of these things are things that many Airbnbs don't provide, but they made life noticeably easier, as there were many small purchases that we didn't need to worry about.
The one important thing to watch out for is that the rooms are very different from each other in nature and in general size (with one room being clearly a lot smaller and less desirable than the others)
All in all, this Airbnb was great and was perfectly set up for college-age students like my son and his friends. I would highly recommend it to anyone going to college in Cambridge (e.g. Harvard, MIT, Tufts) looking to stay with friends some place near campus but not on campus.