Lake Sunapee could very well be the nicest lake in all of New England depending on what you are looking for. In my opinion , there is no finer place anywhere for a lake vacation. (I have been to five continents, and the N Pole - Ex Navy)
George (the owner) takes excellent care of the property & ensures everything is there that you need. This guy is over the top. He missed his calling, he definitely should have been a concierge at the Four Seasons.
The house itself, while older, is very well kept. It's very large, has three full baths & marble kitchen. You could skip a stone to Mount Sunapee skiing or Lake Sunapee.
Dewey Beach access is included in your rental. They have free loaner paddle boards & row boats of all types
I'll rent again for sure