Fiat 500C – Automatic. Purchase advice, known defects, pay attention to what?

Hello! Our Smart Cabrio comes slowly into the years and maybe we need more seats. The car size for the city should be as compact as possible and a convertible should be anyway. Therefore, the 500C came to mind (and I like the 101-hp-ige ). First of all:the automatic is a must. What experiences did you have with the 500C? What would you recommend? What should you pay attention to with a used 500C? What additional equipment makes sense? Thanks for your help! LG