How do you say so romantic in Italian?

Thats so romantic. Ehi, è così romantico. Thats so romantic.

How do you respond to ciao?

Saying hello and good-byeCiao (hello; hi [Informal]) Ciao! is the most common way of saying hello and goodbye informally. Salve! ( Hi; Bye [Formal/Informal])Che piacere vederti! ( How nice it is to see you! [ Buongiorno! ( Hello; Good morning; Goodbye [Formal])Buona sera! ( Hello; Good evening; Goodbye [Formal])