Aloha, Amelia,
Disney's Polynesian Village Resort holds a special place with my family as we celebrated my parents' 50th wedding anniversary there; it will always be a family favorite for us because of the great memories we all had there. In fact, my parents had a wheelchair accessible room, so I can share with you how great the rooms are. My mom didn't have any difficulty maneuvering around in her wheelchair in the room as well as the resort and all of Walt Disney World.
You will find that all of the longhouses have rooms that are accessible, so it may just be a matter of which one you prefer. To get an idea of the different pros and cons for each longhouse, I'd visit tikimanpages.com and then click on the
Longhouses link. The link with provide you with detailed information about each building, including a map of the rooms in the buildings so you can see where each of the accessible rooms are located.
If you are on Facebook, you may also want to like Tikiman's Unofficial Polynesian Resort Pages to see updates and current photos of the resort, including updates of the construction. As the construction changes, it may also determine a building preference for you.
Wishing you a pixie-dusted trip!
-Kara