Keep in mind that the WiFi isn’t always the best even in Istanbul, you can’t use a vpn in the country, and some hotels and cafes require you to input in a national ID number (which you won’t have) to use their WiFi.
If you decide to DN here, do your research on the WiFi reliability of places you decide to book. Email the properties asking about the WiFi speed. It was a surprise to me that this was even an issue since many of the major tourist areas are fairly modern.
I would email the hotel or Airbnb beforehand to check