The apartment is located in a bustling neighborhood, quite close to the Galata Bridge and then a short walk to the wonders of the old city, also close to Istiklal Caddesi and the trendy, fashionable "new city" north of the Golden Horn. It is a comfortable, spacious, nicely furnished studio with access to a roof-top terrace with awesome views of the old city. One drawback for some might be that it is a four-floor walkup, but it's really no problem if you are in good shape and accustomed to old apartment buildings in Europe.
Zehra's assistant Maria was very friendly and helpful and promptly resolved a couple emergency situations that occurred.
I hope to stay there again the next time I visit Istanbul.