You can either book your room via www.booking.com or book a room at the following hotels which are in the vicinity of Yeditepe University:
Istanbul Marriott Hotel Asia (5 km.)
Kayisdagi Caddesi No 1/1, Atasehir · Istanbul, 34750 Turkey
Cevahir Hotel Istanbul Asia (8 km.)
Yalı Mh., Turgut Özal Blv No:261, 34844 İstanbul, Turkey
Another option is the guest house of the University. Considering the limited numbers of rooms in the guest house please get in touch with the organizers for reservation...