I have already written in another thread, now it is formulated as a question :
I have a reservation between 11.april to 16.april in Rome. Will I get double points for this stay (15 april is the end of the promotion)?
I booked two rooms, will take double points for both?
I could not find an answer in terms of promotion.
Ok carat but my promotion is for double points, not for stays. Does this mean I will get points for both rooms.
And the second question: if I leave the hotel shortly after the end of the promotion, will I participate in this promotion?
troytraveler is spot on - you will earn double points for your personal room only.
To answer your second question, if the promotion comes to an end during one of your stays, the nights of this stay spent prior to the end of the promotion period will count towards the MegaBonus. The nights of this stay that come after the end of the promotion period will not earn double or bonus points.