This was my first visit to Waiheke Island and the Tihi Lodge was was an excellent introduction.
Using a car, the property was within 15 minutes of the vehicle-carrying ferry that we used, although other guests who used the non-vehicle carrying ferry service were only a few minutes further away. While we observed that there was bus service within relative proximity to the house, I'd advise against traveling there by bus given the climb from the nearest bus stop to the property. There is taxi service on the island.
The property's remoteness and elevation afforded great views of the island from multiple points in the house and its surrounds, although grocery and food options were easily within a 10 minute drive.
Upon check-in we were advised to "explore" the house, which was an apt description given that its design takes advantage of stairs (spiral and otherwise) and decks that expand and enhance the usable space. The house was well appointed and our communication with the host/property manager was efficient and effective. To wit, 1) we had a minor hiccup during our stay that was quickly resolved and 2) one of our party inadvertently left a personal item at the house and the property manager found the item and brought it to my attention.
While we were only able to stay for a few days given our schedule, we would have happily stayed longer if time permitted. I'd definitely recommend adding this property to your itinerary, especially if you'll be traveling by car.