We had a lovely time on the boat. It is just a short drive to matapouri beach but also nice and quiet away from the crowds there in summer - the best of both worlds.
We did find the bed in the boat maybe a little too snug - it's easy to hit your head on the lowered ceiling or accidentally roll out on the other side if you move around a bit in your sleep.
All in all though, we had a great stay and would recommend.