I stayed with Eddy for three weeks. Eddy is a great host who is accommodating and easygoing. Definitely talk to him about the location before committing.
His place does require the MBTA or ride share but it is easy to get to both. It is easy to get to Harvard Sq and the local schools when/if necessary. You are in walking distance of Star Market, Sofra, and other small stops.
He is very easy to communicate with and knows his way around Cambridge. Feel free to ask him questions when/if you see him around the house.
About the room, I only came by myself but it should be fine for two. Notice that he does offer a lock for the air bnb door. Everything an airbnb renter can use is labeled and he even has your room labeled.