Airbnb faces a patchwork of regulations in the many jurisdictions where it operates. Some places are very restrictive, but some places are welcoming the innovative platform. Lisbon has emerged as a city that welcomes Airbnb and has created a regulatory environment that creates a transparent playing field for hosts and guests while also encouraging the tourism economy.
http://www.bloomberg.com/news/articles/2016-06-05/airbnb-finds-love-in-lisbon-after-berlin-barcelona-shy-away
