As @Gerry-And-Rashid0 suggested,
I was also thinking that most guests will want this to be a sofa and you will have wasted your time, and theirs with having to put it back together, washing clean laundry, ect. In my case, I leave my pullout as the sofa unless they are having more than a couple that will likely sleep together. If it's two friends, I still leave it as a sofa but show them where all the clean bedding is in the closet in case they want to use it, oftentimes I find that they just take a blanket or just share the bed.
And as opposed to asking every guest, you could state it in your itinerary or at end of listing details that the guest should message you IF they would like to find the sofa made out as a bed upon their arrival.
@Marty1 In any case, don't be discouraged by the comment. You will always find guests that must determine some way that they could do it better than you. Best of luck to you!