Yes I was going to suggest we meet at the four seasons where Amaroo is staying as we don't know each other - as Pushka said there is a plethora of places to eat. Why don't we meet at say 1ish on the 19th and have lunch/drink - that gives time for morning and afternoon sight seeing and FS is very near all the sights so not hard to get to. We will be in Karakoy as that is where the cruise ship comes in - we didn't get to walk across the Galata Bridge last time we were there so we can walk across it from the ship and then meet up - happy to do later in the day as well. By the way I really recommend the underground water cistern once you have done big tickets items like the mosques and Topkapi.