Ella and Will are wonderful hosts. The best, one can wish for. Ella texted me before our arrival and explained everything in advance and asked for any specific accommodations we might need.
The pictures are accurate and the house looks exactly as depicted.
The house was extremely clean and in order, Ella has even put together a little binder with house rules and useful info about the neighborhood stores, restaurants and local attractions. It also includes two chargeable public transportation cards which helped us a lot. You can use it for riding buses and the metro in Boston. It had some initial dollar amount so you could use it for a ride or two to your first destination(s).
The house is located in the suburbs of Boston but not too far away; about a 20 minute train ride from the house to Boston south station (in the downtown). It is very close to grocery shops and good restaurants. Very peaceful, quiet and relaxing neighborhood/house. We really enjoyed our time here :)
There is a bus station right in front of the street the house is located in and the train station is less than a 5 minute walk. The only thing I would recommend if you're using the public transportation is to take the bus to the "forest hills" station (about a 10 minute bus ride) and then from there take the orange metro line to downtown Boston. You will save more money this way. The pricier, yet more straight-forward option is to take the commuter train from the Rosindale village station to Boston south station.
There was also a rich resource of brochures and info sheets of all you can do in Boston and it's vicinity.
I hope you choose to stay with Ella and Will and enjoy all they have to offer :)