The waterfall house is a beautiful peaceful oasis. My group stayed there for a month and we loved the location and being surrounded by nature. It was very quick to get to either Honolulu or Kailua/Kaneohe without being in a crowded area. It was very clean and the subtle noise of the waterfall made us sleep great!
Twi and Kalani were great hosts and responded immediately to any questions that we had. One thing to note is that the house is a guest house on the property although it's very isolated and private but you will use a shared driveway and any mail/delivery will have to be picked up from the main house/garage.
We loved our stay and hope to come again some soon!