We are two families, (4 adults, 3 kids, ages 10, 6, 1.5) and the house was a nice homebase for going to Mystic to see the aquarium, or spending a day at the beach. The kitchen was enormous and stocked with everything you could need.
I was pleasantly surprised that there were toys, books, and even a mini pack and play suitable for my toddler.
The yard is amazing, and fully fenced in which was great. We loved the hot tub and the outdoor shower.
The owners were extremely communicative, and even left us a nice welcome basket.
I only have a few minor Cons: Calling it a beach house, or an ocean house is somewhat misleading. The beach is 11 minutes away, and unfortunately there is only one beach pass provided. Squeezing 4 adults, and 3 kids, who still require car seats, into one car was difficult. Given how large the house is, and the number of people who probably want to go to the beach, second pass would be helpful.
The central air is only on the first level, the second floor has some window units, but some the bedrooms do not and so to get any cool air you have to leave the doors open. Those rooms to have ceiling fans.