I took a run through the Haven Mines today, which I don't normally do. And I just want to say that even though it's easily accessible, this dungeon is beautifully designed. The map waypoints for the Main Furnace, Equipment Sheds, etc. are a nice touch. Additionally, the inability to rest inside really adds to the challenge level of the dungeon since it is so long. The fourth floor feels like an accomplishment, and is quite imposing, because of its openness and scale compared to the narrow complex of passages linking up to it. Very nicely done.