You will get differing opinions on these boards as to Celebrity Resorts in Lake Buena Vista and Kissimmee.
We have stayed in a 3 BR (twice) at Lake Buena Vista. We have found them nice, clean, spacious.... I would recommend it as a place to stay. The pool area is small and the front desk service is iffy (but we only talk to them at check in and check out). The Master Bedroom is a king bed with nice size bathroom with a spacious hot-tub bath. The second bedroom is two queen beds and the third bedroom is a den with a mini-fridge and foldout sofa. There is a full kitchen and washer/dryer. It is within a minute of Downtown Disney and just a couple minutes from Sea World. The location is good and there is not much traffic.
So as far as my opinion.... I don't know what you're used to staying in.... but we find them nice for vacations.
If you want to send me a private message with further questions, let me know.