Houston has a 20% vacancy rate [1]. Unfortunately, I can't recall the source but I did read a study that concluded that Airbnb has no effect on rental prices where the vacancy rate is 6% or more but it absolutely drives prices up in low vacancy rate cities.

I live in one with < 1% vacancy rate and it's also a tourist city. Apartment prices have gone up more than 50% in the past few years.

[1] http://www.zerohedge.com/news/2017-04-17/houston-commercial-...