There are only two rooms, joined in the middle and floating in a marina space in Boston harbour (sorry - harbor!). Does that sound offputting? Well, it shouldn't. Karen and Jon go to endless trouble to provide a really interesting experience, and they do it very well.
Good aircon, wonderful home-cooked breakfast, granola on tap (so to speak), huge comfortable beds and rocking to sleep in the arms of Morpheus in the unlikely guise of maritime traffic quietly passing by. It is not cheap, though. (In August for us it worked out to $125 per person per night).
One morning we woke to sunrise and two herons strutting about outside. The next morning to sunrise and a massive Japanese tanker of some sort being manoevred slowly past and out to sea.
If you want to get to downtown Boston from here it is $1.75 per person on the (very frequent) ferry between pier 6 and the downtown itself. Green Turtle is also very near the USS Cassin Young (WWII destroyer) and USS Constitution (frigate from the time of the War of Independence).
Oh, and another thing. You get your own numbered parking space on the pier, and if you have visited Boston you will know that a parking space of your very own is worth more than a 12.5 kilo gold bullion bar.More