volentieri
/voh-len-TYEH-ree/ · adverb
gladly / with pleasure
look it up on WordReference ↗In context
«Ti va un caffè?» «Volentieri!»
"Fancy a coffee?" "I'd love one!"
The happiest way to say yes to an invitation. One word, and you sound both keen and gracious. Keep it ready for every offer of coffee you'll get in Italy, and there will be many.