I can recommend the Sheraton Vistana Villages on I-drive. My family and I stayed there this past March and it is a very nice resort, only approximately 3 years old. Nice pools and cabanas, nice friendly employees and helpful concierge. We enjoyed it because it is smaller and alot newer than the Vistana Resort. I like the feel of a smaller resort, not as busy a more relaxing feel, nothing is a very far walk back to your condo.
The condos are beautifully furnished, nice kitchens with Fiesta dinnerware, dishwasher, microwave and frig. You also get you own washer and dryer in each unit, The dollar rental cars website has very nice pictures of this resort. Just go to dollar.com and click on hotels and then orlando and just scroll through all the different resorts till you see the sheraton vistana villages, the pictures are very accurate descriptions of this beautiful resort.
We really enjoyed our stay there, any questions I will try to answer them!