How to get to the CCD office from the airport:
From the airport, take the Havas bus to Taksim square. These buses leave frequently all day from both Ataturk and Sabiha Gokcen Airports. Once you are in Taksim Square, either take a taxi and ask that they drive you down the Tarlbasi Boulevard where the Euro Plaza Hotel is also located, or you walk 15 minutes on Istiklal to Galatasaray Square, there you turn right into Omer Hayyam street, walk down through the street, pass through the bridge under Tarlabashi Bulvari, and then turn left into Kilic Aslan, CCD office is the fourth house from the corner. CCD office is on the other side of Tarlabasi boulevard, right across the back of British Embassy in Galatasaray. There is a small Turkish flag on the CCD building and a white sign that reads "CCD Erasmus center".
Print out the location plan and show it to the taxi driver. Nobody finds this address by naming the street, since Istanbul is too big for anyone to know all streets by name.