we booked a one bed place in a condo in Jomtien last March on Booking.com not Air B&B and it was a holiday from hell. There were so many rooms booked for the weekend that there was a huge queue for the lifts most of the afternoon. We met a frustrated resident who said it was all AirB&B bookings with mostly Chinese people at weekends. Never again. It was the holiday from hell. And notices up everywhere saying AirB&B is illegal in this building.
It's illegal because most of the AirB&b's are in big condo towers where people live permanently and they do not want hundreds of short term strangers going in and out every day. I think stays of more than 30 days are OK but it's a very 'grey' situation.