Certificated
AVANTGARDE LEVENT
ERESIN HOTELS SULTANAHMET
GEZİ HOTEL BOSPHORUS
HILLY HOTEL
HOTEL LES OTTOMANS
HOTEL MOMENTO GOLDEN HORN
OPERA HOTEL
PARK HYATT İSTANBUL MAÇKA PALAS
ROMANCE İSTANBUL HOTEL
SIX SENSES KOCATAŞ MANSIONS HOTEL İSTANBUL
SURA DESIGN HOTEL
SWISSOTEL RESORT BODRUM BEACH
THE TIME HOTEL MARINA
