We have stayed in many VRBOs around the U.S., and Martin was by far the best host in terms of communication, responsiveness, and helpfulness. (To be clear, we've never had a negative hosting experience, but Martin stands out among a very positive group.)
The property is great, spacious and well equipped. The location is excellent -- about a mile to the state park entrance, and walking distance (virtually across the road) to the parking lot for the St. Louis canyon.
The Starved Rock cabins and lodge are iconic, but Grand Bear is better for anyone looking for a full kitchen and multiple bathrooms.