Istanbul - fun, but don't expect to relax
A very fun city, teeming with life, very often verging on chaos (I couldn not imagine what it would be like to be a driver in this city). Incomparable sights and historical landmarks, incredible history. My biggest gripes are that so much of the city seemed to be geared solely towards tourists, in Sultanahmet someone is always in your face trying to get you to buy something or sign up for some tour or the like. Expect to be busy, don't expect to relax.
Insider Tip:Make sure to also get to the European side and visit Galata Tower, the nearby Tunel neighborhood and the party wonderland that are the outdoor mall and alleys teeming with bars along Istikal Ave