Of course, 7 days to spend in Turkey is not enough. As a Tour Guide I suggest to visit Istanbul well first. And then, Ephesus and Cappadocia. There some historical tours which starts from Istanbul. Please check our tours and do not hesitate to ask any further questions.! Also Private tours with tailor made itinerary can be a good option too! Please Check our Suggested Tours, Highlights in Istanbul and Highlights in Turkey from menu. If you still have questions please get in touch with me!