I like my cities like I like my women, beautiful and crazy
Istanbul always has something going on for the senses. Whether it's the smells from the fish markets and the enticing offers from the very men barbecuing the fish next to the Bosporus strait, shouting "Balik Ekmek! (fish in bread), to the magnificent sights of it's wonders (Blue Mosque, Hagia Sophia, Cisterns) and it's beautifully vibrant markets (Spice Market, Grand Bazaar), there's never a day without a new sensation, or experience. It is an ancient place with a very new and refreshing energy.
Insider Tip:-Stay near the Galata tower instead of Sultanahmet, more authentic, energetic and less expensive.
-Go in Spring or Fall, Summer is often heaving with tourists, and it can get very hot and humid.
-The call of prayer can be a hassle (there's one at 5am) so check out if your hostel/hotel/b&b is near a mosque. It can be quite irritating being woken up so early, not to sound intolerant.