We stayed 1 night at the Fox Chalet. The manager was very trusting, did not ask for a deposit and gave us their regular price at NZ$229 without the cleaning charge which we appreciated.
It's a unique "A" shaped house with ample room for 5 of us. The bedrooms are adequately heated although the living room and kitchen can get really cold and the heat from fireplace did not seem suffice. The house is a little old and requires some thorough cleaning. It's a good base for us to spend a night to explore Lake Tekapo and glad we did!