I recently moved back to San Francisco from Ireland where I worked for 2.5 years. I've had great experiences traveling around Europe staying with Airbnb hosts and meeting locals and travelers wherever I go. I will continue to travel a bit for work and enjoy making more of a connection than just staying in hotels and seeing the sites from outside.
You can also find more info and references on Couchsurfing. I am there under the username yesthatguy. If airbnb has hidden the name of the other site, you can guess or find it by searching for [surf couch].