Unfortunately, there are a few safety issues you should be aware of in Istanbul. Taxis are notorious for ripping off tourists picked up in Sultanahmet or Taksim - make sure the 'day rate' is set during the day (one light on the meter, not two). It's a good idea to ask at the hotel you're staying at where there is a reputable taxi stand.In addition, be aware that there are other tourist scams going on in night clubs. New 'friends' will leave an exorbitant bill. That drink might be drugged. Use common sense, it's a very, very big city with typical big city safety problems.