In the period from 23.04 to 13.06 and from 06.09 to 26.09, for 7 consecutive days of stay you get 2 nights for free (7=5; 14=10; 21=15).
In the periods from 14.06 to 18.07 and from 16.08 to 05.09, for every 7 consecutive days of stay you get 1 night for free (7=6; 14=12; 21=18).
