We had a really nice Christmas in the Chalet of Stephanie, with 4 friends: 2 couples. The Chalet has everything you need! It is spacious, has a bbq, and you can easily sit outside, so after a long walk on the Tongariro Crossing it is a nice and quite place to come back to!
The only thing that is not on the pictures is that the Chalet is in a street behind 2 other houses. So you don't have any view.