If it has to do with business then you are always better of if you consult with and run everything with a qualified attorney. However, based on the prevalence of this strategy I would think there is a perfectly legal way to do it. Many property owners are perfectly willing to lease to you with the right to sublease the same property. However the more you are will to be upfront and disclose your purpose to an owner then I would think that more they will be ok with your strategy as long as they get their rental payment as agreed and on time regardless of whether you are able to rent out to anyone through airbnb.
I this was me I would be looking at touristy areas, places where there would be a great demand for temporary rentals. I for example always rent through airbnb when I go to Hawaii.
I bought a 2 unit building in Buffalo New York in the hopes I can attract people who want to visit or honeymoon around Niagra Falls. I plan to use airbnb there. Vetting is simplified and people generally pay in advance to Airbnb from which I get my rental rate of approximately $100.00 per night less Airbnb's cut.
I could not possibly hope for a monthly rental average of $2,000.00/mo. on a $45,000.00 investment otherwise.
Airbnb rates are generally more in line with and competitive against local hotel rates. In Honolulu Hawaii the lowest priced hotel room I could find was $200.00 per night and the average airbnb rate was $100.00 per night.
I own a 2 bedroom 2 bath house right outside of Ho Chi Minh City, a city which attracts millions of tourist per year and almost year round. I purchased the house all cash for $12,000.00. I usually average about $2,000.00/ per month with it through Airbnb. I could do that in the states.
It is the same as all real estate, Location, Location, Location !!!