There are places like that. It's called "corporate housing". take a look at oakwood.com. They have apartments in lots of cities around the world. A company

There are places like that. It's called "corporate housing". take a look at oakwood.com. They have apartments in lots of cities around the world. A company would contract with them then on short notice could say "I need an apartment in London for a month". The company only deals with the corporate housing place, not the building owners and the buildings aren't dedicated to corporate housing, most are leased in the traditional way. Lots of companies use these services for when they hire someone new who needs a place to stay until they move, or if they have locations in multiple cities and have an employee on a short term assignment away from home.