I've stayed on and off at the Bolton Hotel for some ten weeks over the last few months while in Wellington on business. The Bolton is extremely well located at the Parliament/government end of town. Rooms are spacious (admittedly I had a one-bedroom suite with kitchen) and my various requests (such as removing all the mini-bar contents to make more room) were met quickly.
It's also in a great position for walking.
I'd recommend it for an extended stay or for overnight.
Some of the time my wife joined me and she thought it was excellent.More