I have stayed in a couple places during my stay in Takism area of Istanbul, but Royal Galat is hands down the best, I highly recommend staying here, not only this is in the center of all activities but the staff are 5⭐⭐⭐⭐⭐. Noor, Jahan and Devran were great. Devran's customer service is 10⭐.
the room is very clean, bed is comfortable with extra pillows and comfortable pillows, bathroom is super clean. ice cold AC.
they also make appointment for CPR tests. the tester comes to the lobby for the test. You can leave your luggage here while you wait for your flight. highly recommended!