It's not just a lack of housing. Airbnb is changing neighborhoods by creating increased demand for vacation friendly activities and turning some areas into an effective full time weekend. It's taking popular neighborhoods like the Mission in SF or Williamsburg in Brooklyn or the Gothic quarter in Barcelona and turning them into 365 day a year tourist parties. Any neighborhood with a reputation for being hip, having art, music, bars etc. is now half populated by Airbnb guests at all times.