I use TripAdvisor. We've rented the past two years in Davenport. A bit further away, but we stay for a month at a time, so most of the time we want to be away from the hustle and bustle of the Disney area while going about our daily lives. It's about a 20 minute drive from the Davenport area to Disney.
On TripAdvisor, you can work directly with the home owners, so I always make sure to ask for a better rate for a longer stay.