The Waipuna was the most expensive property that we stayed in while in Auckland.
Two words: Deferred Maintenance. The carpet in our room was burned (previous cigarette burns?), the safety of several electrical outlets was questionable, the drapes had mold on the inside, and the phone in the bath was (quite literally) hanging on by a cord. (I have photos.) Given that this was the Presidential Suite, we were truly disappointed.
Also, rather than placing a hold on a credit card for incidentals (as would be the case in any other hotel), the property insisted on tacking on an additional NZ$100 charge to our card until they determined we hadn't damaged the room (refunded later but could take a week or longer.) If this is standard practice, it should be called out in Expedia's terms.
The property has seen better days. Given our experience, we strongly suggest seeking an alternative property for your stay in greater Auckland.