Two Dutch dudes are Kickstarting an app and service called Pooloha, which is a kind of AirBnB for swimming pools.
Guests will be able to rent a pool for a day or a week, and the price is set by the host, the pool owner.
Part of their pitch is that if you could save money by renting an AirBnB without a pool, then renting a nearby pool separately only on the days you intend to use it. (It's a good point. Our recent AirBnB in Cassis, France, shown in the photo, cost a fortune because of the pool -- and the view.)