Sorry to burst your bubble, but AirBnB is not the only rental agency which is concerned with the crack-down.
All agencies and individuals which list on the internet are being investigated by the Mayor's task force. The information has been gathered during the last 3 years.
Agencies are not breaking any laws by listing apartments for rent, but owners and managers are usually guilty. Many will play around with calendars - or make them unavailable - but will continue to rent year-round. There is also the illegal "one-year lease", which is torn up when a client leaves after a week or longer.
This Thursday, the latest round of "controles" began, targeting 600 apartments in the 2nd arrondissement. Agents will show ID, ask a few questions and go on their way. The clients are not evicted and do not suffer any consequences - all that falls to the owner/agency.
If the owner is found to be renting illegally, he must stop renting immediately or pay a 50,000 EU fine.
It is because the crack-down is continuing, that there is a great possibility that apartments might disappear suddenly from the internet. It is also possible that "your" apartment might be cancelled because the owner did not want to risk paying a fine.
Owners must certify that they are renting legally for under 120 days - providing tax information, an agreement from the building's residents, constructing a new apartment or offer an existing one that he owns to the open market, pay the hotel room tax and finally secure a registration number - which will be prominently displayed on his website.
Exemptions are made for cities with a population of under 200,000. It is not far to some very nice suburbs, where you will probably have much better luck living among "real people", who rent during their vacation periods, rather than living among the tourists or foreign investors.