Where supporters of Airbnb and other rental sites see a catalyst for entrepreneurship, critics see a threat to the safety, affordability, and residential character of local communities. Are the new platforms fueling a black market for unsafe hotels? By bidding up the price of apartments in popular areas, do short-term rentals make metropolitan areas like New York City less affordable? Is the influx of out-of-town visitors upsetting the quiet of longstanding residential neighborhoods? Read full article.