Ironically, the most reliable "link" is physical. Several share houses in Tokyo’s Nakano or Koenji wards post a QR code on their front gate that changes weekly. The code leads to a status page showing whether the house is accepting new "touching tenants." If you are searching for the link online, you may need to visit the neighborhood first.
Why would a share house implement such a bizarre rule? The answer lies in social psychology. 1 funkan dake furete mo ii yo share house no link
While the "1 funkan dake furete mo ii yo" approach can have numerous benefits, there are also challenges and design considerations to be addressed: Ironically, the most reliable "link" is physical