Depending on the time of year, when you book 7 days before your arrival you will have an 18% discount at Axel Hotel Berlin. Or with at least 30 days in advance, a 15% discount, which is also great. 
 

Don't be caught unprepared. Check out the conditions:
Booking 7 days in advance with possibility of modification or cancellation up to 7 days prior to the arrival date. Booking 30 days in advance with possibility of modification or cancellation up to 30 days prior to the arrival date. Consult cancellation policy. Discount not applicable every day of the year and subject to availability of the hotel.