The best option might be something like a serviced apartment, but most of those tend to be in the city. You could look at something like this - http://www.emerald-inn.co.nz/index.html in Takapuna. I guess its going to be hugely dependant on budget.
If budget isnt too much of a worry and the are happy to be in the city, then Heritage (the apartments) and Quay West are prob the better choices.