A neighbor on tour in Baracelona, Spain recently was intrigued to learn what was going on at one of the City squares, where there was a large crowd gathered, protesting some concern. Getting closer, he found they were focused on STRs and Air-bnb. and
There's also a recent article about how the mayor of Barcelona is dealing with this issue, as well as how foreclosures are being handled by the banks. See "Mi Casa es Mi Casa" in the September 28 - October 4, 2015 issue of Business Week.