If you are talking about the ones on the cruise they are a twin bed (approximately) and my dd said they were comfortable. It was comfortable to sit on and to lay on it as a "couch" and take a nap. Hope this helps.
A Single Convertible Sofa is a sofa bed -- twin-sized -- that sleeps only one person. I know the Cat. 2 stateroom has a Convertible Sofa that sleeps two. HTH
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