KoKo Cottage is a real gem! My wife and I, and our 2 sons (12 and 10) really enjoyed staying there. The cottage is perfect, with enough space for all of us, though we spent most of our time on the lanai, whether it was having coffee, dinner or drinks. You have ocean views from the lanai, and also great views of the sunsets. The location is great. It's so quiet and peaceful, but all sorts of restaurants, grocery stores, Target, etc. are only a few minutes away, and you're not far from lots of great beaches!
We spent most of our days at the beach, and they provide EVERYTHING you need: boogie boards, umbrellas, chairs, a cooler, even snorkel fins! Our friends who stayed at another condo had to go buy boogie boards and an umbrella that they ended up leaving behind, so it was a HUGE plus to have all of that available for us.
Luke and Shelley and their 2 kids live on the same property, but the cottage is separated by a garage and they definitely let us determine how much interaction we wanted to have (or not have). Our boys and their son even played basketball together once or twice, but most of the times we saw each other was when one of us was coming or going. Shelley is an artist and told us about an artisan market that she and other local artists had booths at, so we went there and got some good souvenirs, things you certainly won't find at an airport gift shop!
There were so many little extra touches, such as a basket of snacks, a variety of coffee, coffee creamer, some bottles of water, etc. They really know how to make you feel at home. As we left, our boys asked if we could stay there again if we make it back to the Big Island, and we certainly will!