Hi Vanessa!
Thank you for visiting the Disney Parks Moms Panel. The rooms at
Disney's Pop Century Resort have recently been renovated and are gorgeous! They now have queen-sized beds in the rooms which leaves little space to put a twin-sized air mattress anywhere.
One of the beds does turn into a table, but if it's pulled down, then it would be a very tight fit. I remember bringing an air mattress for one of my small children in the old rooms, and it didn't work out so well.
If you absolutely need another bed, then I would check out the rooms in
Disney's Caribbean Beach Resort and
Disney's Port Orleans Resort - Riverside that can sleep 5. The child-sized pull down bed is smaller, but I have slept on it with no issues. For reference, I'm 5'4.
Another economical option would be the Family Suites at
Disney's All-Star Music Resort. They have 4 beds, a kitchenette, and 2 bathrooms.
If you have any other questions, please come back and see us real soon. Have a magical vacation!
Tania