I can't comment on Lake Buena Vista Resort, but Windsor Hills is amazing! A 3-BR townhouse would accomodate your party, and you wouldn't have to navigate a large parking lot or long corridors at night as you pull right up to your own front door. Three bathrooms is also another HUGE selling point! Windsor Palms is also a great resort, and only about 2 minutes further from WDW. We have used vrbo.com for all of our bookings and never had a bad experience when dealing with the owners.
orlandosecret.com is the owners' site for two Windsor Palms properties (townhouse and house) They were our first rental experience, it was perfect and their rates are fantastic. IN WH, we have stayed in this 5 BR house once and have booked another 2 wks in Nov. vrbo.com/82895
I hope you find just the right place for you and have a fantastic trip!