We stayed for a couple of nights at the end of our NZ trip. The place is a bit far from the center of Wellington. It does not take too long to drive, but a car is essential and the narrow road from the road to the hill is a bit challenging.
On the other hand, the view from the windows are fantastic. It is also a great place to stay if you are into planespotting, as it overlooks the airport from a hill, but it is far enough for the noise not to be an issue. We literally spent our mornings checking the Wellington airport arrival/depature schedules!
The house itself is quite small (essentially, a studio with a sliding door for a bedroom), but it is very well designed, so it easily fit our family with two kids.