The house in Riften is a close second, but it doesn't have a convenient smelter nearby, and Riften is tucked way off into a remote and inconvenient corner of the map.
Next time you want to use Honeyside, check for one of Shawk's mods which adds a very cleanly set up basemant to it. With a smelter. I'm not sure if the mannequins still wander around though - I'm using the Ranger Ridge mod now instead of in-game houses.


