New bed!

Airbnb has decreed that on July 1, 2018, and henceforth, all listings must provide towels, bedsheets, pillows, toilet paper, and soap as "essentials". We were doing everything except the bedsheets. As hikers ourselves, we understand the mud, smokiness, leaves and burrs that are part of the experience, and how sliding into our own sleeping bags at night when camping reduces worry about ruining someone's nice sheets. It has always been bring-your-own-sleeping-bag here, and guests have been five-star happy to comply. But rules are rules, and so bedsheets it is. However, in order to provide bedsheets, one needs to provide a bed... We have a sleeping platform, but the 4' x 6' dimensions mean we have, all these years, merely softened the planks with blankets and ground pads.
What to do?
We cut a piece of 6" gel memory foam to size. It is encased in a sort of nylon sock, then the usual cover (folded over in memory of the cut off part), then a mattress protector, and finally full size bedsheets and blankets. 
We are still hoping our guests opt to bring their sleeping bags - trust us, it is the best choice - and that they enjoy this king of groundpads as a luxury.