I've just been assigned to a long term (18+ months) project at the University of Chicago Hospitals, and thus the corporate housing hunt has begun. Anyone have any recommendations for buildings/agencies that specialize in this sort of thing in Chicago (aside from the Bridgestreets and Oakwoods of the world)? I have calls into the big name corporate housing companies, but would prefer to find even a B&B/flat sort of arrangement or go directly through a building's management.

Also, recommendations on neighborhoods to explore would be great, as I'm hoping to find something close to mass transit, but with a good neighborhood vibe.