We also had a rollaway at BWV in a studio but there was a $15 a night charge for it and it takes up a lot of space even when upright. Since then we take an air mattress and rechargable pump with us since we have two teens age 15 and 16 who won't share a bed. The cushions were my DGD favorite even at age 13 since at OKW we had the ones from both the sofa and love seat. You may have some from two sofas depending on the two bedroom unit you get. We tucked them against a wall in a corner which with the sheet tucked in kept them from separating. The kitchen floor area might work for a small child. Just don't forget you need extra linens to do this or bring a sleeping bag. If you are there more than two days, at $15 a night even if you can get the rollaway, it pays to buy the inexpensive air mattress, a light weight sleeping bag or fleece blanket and leave them there if you can't get them in the luggage on the way home. They can also be put out of the way during the day. Since we have been doing this I just pack an extra duffle bag with these things in it along with laundry soap tablets, coffee filters, and other items I might not want to purchase in large quantities while there.
Have a great trip.