We have probably stayed in around 12 Bookabachs in New Zealand. This place is a combination of the best of all the different places. Of course, there are larger bachs out there, but for what it is (two bedroom cottage with one bathroom), it is perfect.
It is very quiet, which is very important for us, set a reasonable distance from the main house and neighbours and roads.
The mountain views are amazing, visible just sitting on the living room sofa.
20-30 minutes from skiing at Coronet Peak / Remarkables and 40 minutes from the base of Cardrona. Arrowtown has some shops, only 5 minutes away.
The cottage is in near-perfect condition, with every imaginable convenience, including washing machine and dryer. Heating is very good. The "little touches" are everywhere - right down to providing (unopened) jams, muffins and hot water bottles (good for aching limbs after after skiing).
Everything is spotless, notably fridge and toilets.
I also liked the fact that everything in the cottage is for the guests - there is no confusion as to what is "out of bounds" or owner's property.
Extremely comfortable bed and quality bedding.
Jane is a great host, highly communicative and helpful.
Can't recommend this cottage more highly.