I am a seasoned traveler, and usually don't go on organized tours. But a few years ago, I booked with Gate 1, as I was uneasy going to a Muslim country with an indecipherable language.
It was THE most interesting trip I have taken. Our tour guide (unfortunately, I can't remember his name, but he was middle aged) could have been a college professor. He was a veritable fount of information-historically, culturally and politically.
And, for the record, Istanbul is one of my favorite cities and it was very urbane when I was there. I hope that, despite the troubles in that part of the world, those of you who enjoy learning and seeing things, give it a try.
Product or Service Mentioned: Gate1travel Tour.
Reason of review: Fair pricing.
I liked: Our guide.