On our trip last April DGD 4, slept on the sofa bed with a bed rail. DGS 2, slept in one of the Queens with 2 side rails (We had 2 rooms). They are of good quality and it fit fine.
She was very comfortable on the sofa bed. Mousekeeping straightened it up each day and when we would arrive back in the room, her stuffed animals were rearranged and posed etc.
You will have a great trip.