I've got a 20 hour layover in the Old Town area of Istanbul. Have never been to Turkey before but am looking forward to it. Am looking for recommendations for local food. Not looking for fine dining or ultra-tourist hangouts and I will be alone so would prefer street food or casual settings where that is acceptable. Any recommendations fo places and must eat items to try would be greatly appreciated. Am willing to walk within 30 min to get to places too. Am happy to report back any great finds. . .