From what you've said I'd say that Wellington would be perfect for you.
It has a lot of nice cafes and a happening art and music scene. It is smaller than Auckland, which is a city easy to get lost in. And has a lot of history to it. The climate is pretty mild, I'm not sure where you are comparing it to, but I'd say mild, I think they get snow on the surrounding hills during the middle of winter but not much else. I have never been to Victoria University but I think it would be an appropriate choice, and considering Wellington is our capital, political history and records are all there. The museum te Papa is a pretty great resource too.
And I recommend New Zealand history, it's pretty compact as far as histories go but also very interesting!
Hiking places is also relatively easy, there are areas really nearby and its a skip and a jump to Abel Tasman National Park which is gorgeous.
Besides you will be in the middle of the country so everything will be relatively easy to get to and Wellington is big enough that you won't feel like you are in the middle of nowhere (it is quite easy to feel like that in other parts).
And you won't get eaten by bears. New Zealand doesn't have any bears.
Good luck and if you need anymore information, don't hesitate to message me!