We traveled out to Mattituck for spring break with two other families - six adults and five children (ages 2-5) - and had a wonderful stay at Breakwater Estate!
The house/property is beautiful and well-designed. It is also spacious, and was particularly well-laid out for our three families, with each getting our own "wing"/space upstairs. Downstairs has multiple living rooms - allowing us all to congregate together or let the kids play to themselves while the adults enjoyed some (relatively, brief) quiet time. We spent a ton of time in the wonderful kitchen - gathered around both the island and the amazing (and amazingly large) banquette. Despite being there in the off-season, we were able to make great use of the backyard as well - enjoying the hot tub, grilling out, and making smores in the fire pit.
The location of the house is fantastic - we were able to bike/scoot down to the beach in 10 minutes or so, and it was an easy drive to Greenport/Orient Point, as well as all the surrounding wineries.
Finally - the rental experience was super smooth. Kim, the property manager, was proactive in reaching out to us with info on the house and area, and was extremely helpful throughout our stay. We had an unforeseen request/need mid-stay, and Kim was super responsive and accommodating.
This property has our highest recommendation! We can't wait to return in the future!