It depends on what kind of activities you plan on doing, but I recommend you to visit Istanbul anyway. The city is great any season of the year. ;)

ı agree..Istanbul has really beautiful,touristic and mystic places..you can see great museums,mosques or park for visit..but if you want to go to hot place you should go to Izmır..It is an only another beautiful city of Turkey..ı hope you will love turkey and turkis people..because they are really sincere,reliable and hospitable..have a nice trip :)

Istanbul the greatest place i have seen :) sultan ahmed mosqe,aya sofya,kadikoy :)

Everybody visiting Turkey should visite İstanbul for several reasons but there are a lot of nice places all over Turkey. In Istanbul, there isn't just historical places like sultanahmet but other locations like the Bosphorus or Taksim or Bebek or Moda which reflect the soul of the city..

you will come istanbul ? you will visit another cities ? our suggestions in istanbul sultanahmet, ortakoy,bebek ... if you visit another cities, i cant count that. lots of nice places :)