I have stayed off property each time we have gone to Disney. Your rental price seems really high. The most we have paid for a 4 bedroom with pool was just over $1000. I don't recall the cancellation policy. We stayed near Champions Gate recently and felt this was the best site near Disney. We were at the gates of each theme park within 20 minutes. It was mainly highway traffic and we avoided traffic lights...etc.
Abbey At Westhaven Vacation Rentals
We also stayed at the CaribeRoyale which had decent size suites. You can find some good deals through Mousesavers to this place. (We paid $99 for the night that we were there)