Unfortunately I had no chance to check how good looking the firemen were...

In the meantime the hotel got back to me saying the alarm went off due to refurbisment in one of their meeting rooms. The dust accumulated so much it triggered the alarm so they had to evacuate and check.

Is it acceptable for vis-major? It is obviously not an alarm from a "bedroom" as the front desk lady earlier indicated so they cant blame it on a third party. Also as one of you mentioned before, it could be isolated by sections to alarm parts of bigger buildings and officer on duty to check quickly which sensor indicated the event and for what reason before they call the whole fire department and evacuate the whole building.