Very nice location close to most things a tourist in Istanbul wants to go to; Galata tower, Istiklal, Golden horn etc. You could even see Galata Tower from one window and Topkapı palace and the Bosporus from the other.
We appreciated that there were plenty of water bottles there for us. The apartment was nice, the only problem we had was an a bit noisy fridge.
The hosts handled the communication very good, fast and answering.