If you go to post #3 of the disABILITIES FAQs thread, there is a link to a trip report from eternaldisneyfan. Her family stayed at an accessible off-site home that had a pool with a hoist. I am not sure of she gave contact information for the owner of that home, but I think she did.
One thing to think about with an off-site place is how you will get to the parks. If you are staying on site, you can take the WDW transportation.