[tjpnz]

It's quite common for apartment blocks to forbid "holiday" rentals. Mine has visible signage about this in the lobby and the building manager also looks out for it. Your typical apartment owner has zero interest in all the trouble these arrangements bring.

[shiroiushi]

That's for regular apartments. The blog author went to a monthly mansion, which are used for holiday rentals and other short-duration stays of a few months or so (such as people moving to a new city and needing a place before they can find a permanent apartment, or maybe people on temporary work assignments in a new city).

[forgotoldacc]

They do. But lots of people buy homes just to rent them out. That removes a home from the market, and the competition pushes prices up.

The problem isn't signage.

Plus evicting/canceling a contract is an arduous process. It almost always favors the renter. And in the case of actually buying a home, there isn't much anyone can do.