Certificated
INNPERA HOTEL
INTER HOTEL
INTERCONTINENTAL ISTANBUL
İPEK PALAS
İSFANBUL
İSTANBUL ANTİK HOTEL
İSTANBUL EPHESUS HOTEL
İSTANBUL GOLDEN CITY HOTEL
İstanbul Gönen Hotel
İSTANBUL HOTEL NENA
ISTANBUL MARRIOTT HOTEL ASIA
ISTANBUL MARRIOTT HOTEL SISLI
İSTANBUL MY ASSOS HOTEL
İSTANBUL ROYAL HOTEL
KADIKÖY RIHTIM OTELİ
KALYON OTEL
KARİYE HOTEL
KAŞIBEYAZ RESTAURANT
KAYA ISTANBUL FAIR&CONVENTION CENTER
KAYA OTELİ
KEMPINSKI RESIDENCE HOTEL ASTORIA
KENT HOTEL
KİLYA HOTEL
KİLYOS KALE