This little location was something we came up with whenever we needed an Underdark village or crossroads. We knew it would be full of weird stuff that topworlders would be unfamiliar with and that's essential when getting the Adventurers out of their comfort zone.
Its a Locale with Influential Personalities, offbeat Monsters and a couple curious little Encounters. Its probably not enough to create a complete scenario or adventure, but its a perfect spot to visit for unusual goods or interesting conversations. If you want to expand the map simply assign a time/distance for the passages. In other words simply move the various rooms and chambers further apart to allow for a bit more exploration and the possibility of random encounters.