There is an art to being a good guest. Well, if you don't believe me, try lying around burping on your host's couch while you ask him to bring you another beer, and see whether you get invited again.
I demand – nothing. You are in someone else's home, staying free of charge, so don't complain about anything. If the mattress is hollow, put it on the floor, but say nothing. Don't complain if there is no internet connection, vegetarian food, en suite bathroom or laid on transport.