Overall, we had a great time at the North Shore and enjoyed our stay at John's treehouse. The morning view from the terrace is truly breathtaking (especially with lots of humpback whales swimming by and jumping right in front of our eyes). The house itself carries most of the things needed, though its size should only be sufficient for two but not more. In general, our expectations where quite high after reading the previous reviews and we were a little bit disappointed at first about the cleanliness upon arrival (dust in bathroom, underneath bed and on/below fridge). It was taken care of once we mentioned it.
In summary, we can absolutely recommend this place to anyone wanting to avoid in the Honolulu area and looking for that "special" Hawaiiian getaway. Thanks for hosting us, John, we'd always love to come back! :)