Itinerary for Greece & Turkey

Both countries need at least a week each at least to just scratch the surface, let alone visit all key spots. What are you interested in seeing? Ancient ruins, Byzantine churches, cities, islands, coastlines?

...7-day itinerary to Greece and Turkey,

7 days in each country or 7 days total to cover both?

If 7 days is your total time, pick one.

Pick one or see Istanbul and Athens only.

I agree, just Athens and Istanbul, or pick one and then add somewhere else in that country. You’d need 7 weeks to cover all the key spots in both countries, and even that would be pushing it. Good luck!