It's in a hilly part of the CBD. Just remember for every hill you walk up, there's a walk down as well. There are some hotels near or on the harbour which are also on the flat. Hilton Auckland which is built over the water, Mercure (Not on the harbour) but about 200m walk on flat. Copthorne Auckland, which is on Quay Street, at the Harbours edge.
Hope this helps.
