I highly recommend Zeynep's place. It's charmingly decorated, with nice personal touches, in a historic building. Clean, and fully accurate to the post. Zeynep was very easy to communicate with - and the place is fully accessible through remote check in. So easy! It's also conveniently located - a 2 minute walk from Galata Tower and a 10-15 minute walk from Taksim. (The only slight downside would be that it looks out onto an internal courtyard. So, there is not as much natural light. But that did not bother us at all!)