What was Marco Polo's response to paper money? How did he react?

I would assume he wasn't used to it because all he was accustomed to with using gold

Marco Polo reverently described Khubilai Khan and his palaces, along with paper money, coal, postal service, eyeglasses and other innovations that had not yet appeared in Europe. He also told partially erroneous self-aggrandizing tales about warfare, commerce, geography, court intrigues and the sexual practices of the people who lived under Mongol rule.