If you're personable, you're friendly and get along well with other people. Being personable is part of what makes you the star of the sales team — people just seem to like you.
Someone who's personable can be outgoing, charming, nice, bubbly, amiable, pleasing, or generous, but he doesn’t have to be all of those things — it just all needs to add up to being pleasant. You may be pleasant but not bubbly, and that’s personable. In fact, if you're too bubbly, you might stop being personable and become annoying, which is not personable.