Hello Adrienne!
Oh...it is so much fun experiencing Walt Disney World with three small children! My family matches up with your one and three year old, so I can totally relate to your stroller dilemma!
We have actually found the best stroller for our small children has been the Sit and Stand stroller. It allows our three year old to stand up while we push him, and he can sit down when he gets tired. Now, with your age range, I would recommend the Sit and Stand stroller
and an umbrella stroller. That way all three kids will have a place to sit and rest. Another great thing about the umbrella stroller is that it is lighter and easier to get on and off the bus transportation system. NOTE: The Sit and Stand strollers are quite heavy; however, the benefits far outweigh the challenges!
OK...now for your accommodations:
If you are looking for the most economical place to say, I would definitely recommend the All Star Music Suites! We have stayed here several times, and it's perfect for all
seven of us! The pros of the suite are that it has two bathrooms (HUGE PLUS), a nice kitchenette, and a large living area. The only con is that the ottoman sleeper bed is not that comfortable. (My ten year old daughter says the sofa and the chair sleeper are more comfortable.) If you are looking for some other options, click
HERE for a list of all great resorts that will accommodate five or more guests.
I hope this helps you in your planning! If you have other questions, please let me know!
Have a MAGICAL day!