I had a great stay at this apartment.
It's tastefully decorated, we had an easy check-in with Tarkan, who is a pleasant and engaging man.
Little could beat the location of this place, in Galata right near the tower. You're literally steps away from very cool shops and restaurants. They have an outdoor terrace which has one of the best views in Istanbul as well.
Considerations: it's a 3-story walkup and the neighborhood is pretty hilly. Also, the windows let in a bit of air and street noise, which isn't bad, but won't give you complete silence.
Overall, I'd 100% recommend it to friends and would stay there again without hesitation.