The adjectives, Urban and Urbane, both mean “city-like”—but in different ways.
Urban can describe almost anything city-related. An urban environment is a crowded and artificial one, with many buildings and busy streets. We can talk about urban transportation, urban lifestyles, urban housing, urban culture, urban youth, etc.
Urbane refers to qualities of people that live in cities—or rather, qualities associated with city people in the past—well-mannered, polite, sophisticated, and suave (i.e., “socially skilled in the ways of upper-class urban society.”)