My family wanted to spend the weekend in Viaduct Harbor. Most hotels were twice as expensive as usual because it was the weekend. I accidentally found this space on Airbnb and booked it right away. Location, space, cleanliness, communication, price are all great.(It's exactly same place with Hilton Hotel).
The only drawback is the parking fee. People who stay here with a car have to pay a lot of parking fees(weekday about 80nzd, weekend about 40nzd per day, of cource Hilton hotel need to pay 55 nzd per day).
Downtown, ferry terminal, subway station are all in walking distance, so I think it is the best accommodation for walking travelers.