Source : Webster's Revised Unabridged Dictionary (1913)

Affableness \Af"fa*ble*ness\, n.
   Affability.

Source : WordNet®

affableness
     n : a disposition to be friendly and approachable (easy to talk
         to) [syn: {affability}, {amiability}, {amiableness}, {bonhomie},
          {geniality}]