Hi there, Chelli!
Your stroller preference is entirely at your discretion, and there are advantages to each. I would consider two factors: how much "stuff" you plan to bring/purchase and how much you plan to be separated from your travel party.
If you're going to bring a great deal of gear, you might want to consider the double stroller, simply for the storage.
But if you are planning on splitting off from your travel party, each child might need access to his/her own stroller.
My instinct is to err on the side of parent comfort and bring a "loaded" double, but again, if there's going to be different plans for the children, go single.
Disney's Port Orleans Resort - French Quarter does offer a coffeemaker in each room. You'll also receive coffee and extras.
You are welcome to request bed rails in advance and upon check in. Give them a try and if you do not like them, the Front Desk can send someone to retrieve them.
Have a wonderful trip!
See you later, celebrator,
-Deborah B.