Young professional. Recently moved elsewhere in the state for work, so my wonderful Austin apartment sits vacant. I'm moving across country in July/August-ish so I'd like to get help paying rent by using airbnb. Doesn't hurt that you get a nicer, bigger place, for over half the price of an Austin hotel, too. :)
Oh- and I use airbnb for traveling to other states quite a bit myself.
All in all, I love saving money, making money, helping others save money (especially when it makes me money), and traveling. Airbnb has it all!