First, I need to choose what my guests will sleep on. Since I don't have guests all that frequently, it makes sense to choose a superhero guest bed - one that has a secret identity as a bed while maintaining a daily cover identity as a strong and stylish sofa. This is the Nomade-Express from Ligne Roset. It gets very good reviews on comfort, durability, ease of use. This is what I'd pick if price were no object.