Seahaven is a great house. We (6 adults and twins) visited it during 2016 memorial day weekend and all of us thoroughly enjoyed our stay.
The house is huge with multiple beds. It was clean and well maintained, with lots of supplies and utensils in the kitchen.
There was even tons of toys for kids to play. So kids loved the house too. Neighborhood is quiet and felt pretty safe.

It is pretty centrally located in Santa Cruz, near E.cliff drive. We could walk to the twin lakes beach in around 10 minutes.

Robin was very prompt in answering our queries. So overall a wonderful experience. We would certainly like to return to the house next time we spend vacation in Santa Cruz.