I have been using Airbnb since 2011 -- I found it when I was travelling through Europe. It was an amazing way to really get to know a city and I loved all the people I met!
When presented with the opportunity to study in London, it was because of Airbnb, that I was able to keep my apartment in New York and pay my tuition in London.
In June of 2014, my landlord passed a rule against tenants using Airbnb and I was no longer able to rent out my apartment and was also forced to cancel the future guests I would host :(
I still use Airbnb for my travels and love it!!!
Airbnb, honestly, rocks my socks!