Luggage storage in Istanbul
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However, if you are flying in and out of the Cappadocia area, and then flying home you might be much better off to store you luggage at the airport. If you plan to spend time in Istanbul after Cappadocia then as the OP mentioned, I am sure that the hotel will store it for you. I believe that there is a storage service. You can check on the Istanbul forum on Tripadvisor. We got a great deal of good information on this site.