There are a myriad of ways to book hotels right now.
There's no reason, that with more open regulatory scnearios, there wouldn't be a myriad ways to 'book your 6 room flat'.
Or rather, you could have the option to list with a few.
AirBnB 'broke through' into a market that didn't quite exist, partly because it's literally illegal in most places. Very few landlords allow subleasing rooms as well.
Both AirBnB and Uber created a market in a 'regulatory grey area' so they kind of developed a marketplace monopoly.
If that gray area did not exist previously, AirBnB and Uber would not have had the power to break through and dominate.