Smrocco, you may want to post an ad on craigslist.org that you are looking for a handicap accessible rental. Also, you need to look at the Americans With Disabilities Act, I'm not positive but I THINK a landlord is required to let you make the necessary changes.
Please contact me by email. I will check with a disabled friend of mine and ask him what his successes have been when looking for rental properties. I assume you are looking for wheelchair accessible with ramps, rails in the bathrooms, etc?
I can't make any promises but I will at least try to get info for you!