My wife, toddler, and I spent Labor Day weekend at Jim and Angela's wonderful cottage by the beach in Sandwich. The cottage is cozy and extremely family friendly and is very close to the beach. The bedrooms are cozy and bathroom is perfectly functional. The place has a smart TV that you can use to sign into your Netflix and watch on a rainy day. The backyard is wonderful and a good place to let your kid run around and burn off energy when they're not at the beach. The family friendliness extends to the fact they have a baby gate available to block access to the stairs. There's a lot of these small touches that make the place especially family friendly.
The kitchen is stocked with basic cookware and plates and is sufficient for basic meal preparation. If you, however, are a gourmet, I would suggest bringing your own knives and pans. I did not get to try the grill because the weather was not suitable. The coffee maker wasn't working when we were there and we improvised (I plan to carry my Aeropress next time).
The weather was quite cold that weekend and so our beach time was limited to one and a half warm days, but those times were great. You can smell the ocean perfectly from the front yard, and my son automatically knew the location of the beach and started running to the ocean. The beach is a wonderfully large strip of land with soft sand and stunning views of the ocean.
The views of the night sky from the backyard are stunning - as someone who grew up in one of the world's most populated cities I never realized how much light occurs at night during a full moon.
We only got to try the outdoor shower once during the weekend because it was too cold the rest of the time but I plan to try it more next time.
Jim is incredibly responsive to emails, texts, and concerns and always responded to us within minutes of a question. There weren't too many questions because everything is self-explanatory.
We absolutely loved this place and are coming back for a week this summer. I highly recommend it. I've already recommended this place to friends.