Suave
WordNet
adjective
(1) Smoothly agreeable and courteous with a degree of sophistication
"He was too politic to quarrel with so important a personage"
"The hostess averted a confrontation between two guests with a diplomatic change of subject"
"The manager pacified the customer with a smooth apology for the error"
"Affable, suave, moderate men...smugly convinced of their respectability" - Ezra Pound
(2) Having a sophisticated charm
"A debonair gentleman"