Only the best of the best achieve the coveted Five-Star, our highest rating.

EcoLab and International SOS will also be involved in Lead With Care outlining procedures that guests will notice as well as enhanced safety procedures behind the scenes. Our certified, anonymous inspectors can visit your property any time to evaluate service and facility based on the same stringent standards we use for our Star Ratings -- or based on your brand's own standards. ALL RIGHTS RESERVED. When it reopens on June 1st, the Four Seasons Istanbul at the Bosphorus will have full safety As they reopen around the world, all hotels will have to guarantee safety to their guests in terms of cleanliness, decontamination and social distancing. Quality Assessment.