We really enjoyed staying at Derins house. The flat is super nice and cozy and exactly like the pictures. The location is perfect, in the middle of Beyoglu, near Galata tower and really amazing little shopping streets with plenty of cafés, restaurants and bars , and everything in walking distance. We definetly recommend it, although it is a 6th floor without elevator and it's a little bit noisy at night. Derin is a super nice host, thank you!