This idea (app) is based on I WISH THIS WAS http://candychang.com/i-wish-this-was/, and this idea (app) extends I WISH THIS WAS's approach by sharing information of vacant houses between local and global people using QR code and Internet. This product is prototyped by Team Sazae at The First Open Data Hackathon in Tottori.
The First Open Data Hackathon in Tottori
https://code4tottori.doorkeeper.jp/events/28892