We have a sofa sleeper that we are giving away for free. It has a good, clean, full sized (not queen-sized) Sealy mattress that hasn’t been used much. The sofa dimensions are:

70” long, 36” deep, 33” high.

The cushions are still very comfortable but the fabric is a bit discolored in one spot. It looks fine with a quilt thrown over it.
You haul -- it is located 2 1/2 miles from campus.