Lara, there is certainly a bit of a crackdown by City Hall happening. The bottom line is that an individual owner could get hit with sanctions, but with so many rentals and the fact that it has been going on for the last several months, as opposed to years, means that the chance of something going wrong for you is relatively small. It will be tighter and more difficult in the coming years as it gets sorted out.
I would recommend staying in solid contact with your AirBnB host/hostess. Hopefully you were careful and rented a unit with lots of positive reviews, and have an owner who is engaged and available in case of issues. Some buildings will have more vocal opposition to other owner owners renting short term, and this is where a problem can occur. I wouldn't worry too much about this, just keep in touch with the host.
Also, some have taken to making cancel-able hotel reservations as insurance. I personally don't think it's fair to the hotel, but it is happening and I wouldn't blame you if you did just that ;-)