We went on a hidden Istanbul tour with Salih and very much enjoyed it. This tour had the perfect combination of things for us: very knowledgaeble and friendly guide, walkable route and frequent stops for contemplation and refreshment. I learned a lot about historical and modern Istanbul and Turkey. Salih was very polite and informative when I asked him how young Turkish men and women meet (the question could so easily have been misunderstood). The only difficulty we had was in finding the office in Sultanahmet; maps are helpful up to a point but it's a small doorway and a verbal guide to nearby landmarks (cafes mostly) would be gelpful.