Me and my parents had a delightful stay at Dianne & Peter's place, so good that we were kind of regret to only be able to stay for 1 night. Dianne & Peter came down from their house to The Treehouse in the middle of rainstorm to welcome us personally. They also made a very easy arrangement for us to checkin despite the weather and our uncertainty of arrival time.
The Treehouse itself is a very warm, self-contained and fully-furnished house in front of Dianne & Peter's, equipped with yard for parking. The house was very clean and tidy, with air-conditioning/heater and comfy beds for up to 6-7 people (if I'm not mistaken). Pantry was also fully-furnished, clean and tidy. Gardens and trees surrounded the house made it look so pretty and pleasant to stay at.
Thanks for letting us stay at your place, Dianne & Peter. I highly recommend their place of you are around Thames or Coromandel Peninsula.
ps: thanks for the tips and macadamias :) :)