We, a family of 5, stayed in the Ko'Olina Beach Villas on the 9th floor. It was absolutely great! The view of the ocean in the distance and of the various pools and the Koi pond was gorgeous.
Ko'Olina has something for everyone. The Longboards Bar & Grill next door at the Marriott is highly recommended, as is the fish restaurant at the Disney resort. You can enjoy their amenities, without having to be part of a big operation.
The staff at Ko'Olina Beach Villa was helpful, our greeter was very friendly, accessible and knowledgable about the local scene.
All in all, we (end of our 40s) and our kids (16, 18, 19) had a great time and enjoyed ourselves.
Our host (the owner of the villa) was courteous, professional and replied promptly to all requests and questions. The villa comes equipped with everything you need for the beach and trips around the island. And the real thing is as gorgeous as the pictures.
All in all, a great stay!