@Dean6 you won´t get an answer from Airbnb. If you do they will simply tell you to observe local laws.
And given your question i assume you have never registered your apartment with the local council as a holiday apartment or paid the required 5% city tax. If so, technically you have been illegal for the past 2 years.
Yes, for the majority of holiday apartments in Berlin, as of the 1st of May they are required to cease short term letting. They have just increased the fines up to 100,000 euro for people who continue to rent out short term after this date.
The goverment is being relentless on this issue particularily as it is an election year.
I see that your calendars are open after ther 1st of May and you are taking bookings.
Your Airbnb apartment details including incomes are available on the web for anyone to look through.
Even if your name is not Dean and the address you have advertised is "next door" you are still traceable and an update from the Senate allows the goverment to ask Airbnb for the Berlin host database.
Or, it just takes a neighbour to report you to the council when they notice the continued suitcases or late night stranger behaviours.
Here is a University student project site, to give you an idea of how easy it is to gather data from Airbnb.
http://www.airbnbvsberlin.com/
