We've used orlandovillas.com a few times. It is a british-owned site with mainly british owners and all the villas are personally visited and verified by the site owners who also run a fairly popular orlando forum which has a link from the site - all very enthursiastic and helpful. There are 3 linked sister sites (no idea why) so if you are doing a general enquiry, make sure you do all 3 to maximise your responses. We stayed on Highway 27 once and found it a bit far away. The last few times we have stayed at Windsor Hills which is the closest villa community to Disney (unfortunately orlandovillas.com don't have any villas there) - it's more resorty than residential and tends to be more expensive than most of the other communities but it's got good amenities (pool with waterslide, onsite shop, gym, tennis courts, games room) and is very handy for driving. And at that time of the year, I would definitely go for a south-facing pool.