We truly enjoyed our stay with Petr. He is a no nonsense kind of guy, but very hospitable and lets you use anything you need. He even made me a coffee in the morning. There was an AC in our room, maps that we could take with us and a very cuddly cat. The place is not in the city centre, but was easy to reach with the orange line. As a side note: the house is clearly lived in, don't expect a hotel room, but you'll have everything you need for a pleasant stay in Boston.