I rented from a Dr. in Illinois once. It was great, he posted, I replied and I was able to use my CC as he took them at the office. His "girls" then scanned the receipt and sent it to me. They also sent the confirm letter.
Later I had a bit of a problem with ?? and I called him back and he took care of it. I think it was the dining plan or transportation.
The entire experience was wonderful, the room was perfect and it is such a value!!!! For $160 a nite we stayed in a beautiful 1 br at OKW with a wash machine, dryer, full kitchen and lovely patio with fan.
I would make sure the person has a high post count and posts that represent something about them. I post in the budget area a lot. Look at the DVC rent board and there are also sample contracts.
I have read once or twice about deals gone bad, but it was more bad judgement on the renters part and unrealistic demands from the seller. One guy sent a western union payment to the girl without any contract
Good luck and it is a wonderful way to save money and have a beautiful room.