Certificate of Excellence is given to Accommodations, restaurants, attractions, and vacation rentals that get excellent reputations.
・ Maintain an overall TripAdvisor rating of at least four out of five
・ Have a minimum number of reviews
・ Have been listed on TripAdvisor for at least twelve months. A business must be listed for the full 12-month qualifying period between April 1 to March 31 to be considered. Recipients are announced only once a year in late May.
(quoted from Trip Advisor’s official website)