We do not have a spare bedroom or a sofa, but still host the occasional overnight guest. This is my solution: a gel foam mattress, pillow and a warm comforter.
I’ve had the inflatable beds before, but each developed a hole after just a few uses. And said hole was discovered as we were trying to blow up the bed at 10pm. This set up is compact, portable and leak proof.
Quaker Stylist 
That’s a smart solution. Early in our marriage my parents came to visit, and we had nothing for them to sleep on but extra blankets and the floor. Fortunately, they were avid outdoors people, used to hiking and sleeping in the woods, so they considered an indoor floor and clean blankets a luxury.:-)
LikeLiked by 1 person
And if you set the expectations so low early in the marriage-what ever you offer them later will seem luxurious!
LikeLike
Great idea, that gel foam mattress.
LikeLiked by 1 person
I have slept on it myself for months at a time. I can recommend it as quite comfortable!
LikeLike
Great idea!
LikeLiked by 1 person
Very smart solution! Much more durable and likely more comfortable than an inflatable mattress.
LikeLike
I do find it far more comfortable than the inflatable mattresses.
LikeLike
Love your idea! We just bought a good quality foldable camping bed (to use in our very small back yard as a sofa / lounger / bench) and it’s amazingly comfortable. Folds away into a size of two camping chairs. Thought I’d share – I think our camping bed plus your mattress would make a luxurious sleeping place.
LikeLiked by 1 person