We were in Queenstown during a very cold week. Being from the tropics, my family was particularly sensitive to the cold. The bedroom upstairs and the washroom both had very good heaters, so we slept very comfortably and had comfortable showers. The kitchen/dining area was a bit cooler, but still ok except on the very coldest of mornings.
The hosts were very nice, responsive and gracious, even lending us an umbrella on a rainy day.
The location is spectacular, the views are awesome, and overall we were very happy with this experience.