I advertise how many people can actually sleep in a bed because I do not consider a sofa bed comfortable by any means. It's folded up and has no box spring. That said, if someone asks, I do have a sleeper sofa in one house and I have tried it. I also check it about twice a year. I also have one of those waffle mattress toppers in the closet for the sofa bed. I found that the people who use it have teenagers and want to separate the boy(s) from the girl(s).
I would tell the rental agency, Kathy. If the sofa bed is in such disrepair, chances are the sofa needs replacing. You're a regular guest at this house and I know, as an owner, I want to know when something bothers my guests. This is not trivial like some of the feedback I have received, like one dish towel missing or a light bulb blew out. Even if the owner does not have the funds to replace the entire sofa right now or the mattress, at the very least they should provide a blow up mattress, as an alternative, so their guests do not have to trek one into town.
Thank you Mangy! Here is exactly what it says on the Rental Property Management site for this particular unit:
Accommodations:
1 Bedroom
Sleeps 4
1 Bath
1 Queen Bed
1 Queen (Sleeper)
So of course one would assume it would be in good condition. Your suggestions are completely resonable. We will contact the Management Company before we return and make them aware of the situation. Thanks again dear.