Özgür's flat in Beyoglu is amazing. The view across the Bosporus from the terrace and the little balcony is incredible . The flat itself is super clean, bright and comfortable, the stairs to the top floor are really easy to manage. The street is quiet but still lively with a few boutiques and cafés. It's right next to Istiklal Caddesi, a busy pedestrian street that goes up to Taksim Square. The many small side streets going off of Istiklal C. are full of nice bars and restaurants.
Özgur is a great host. He was always quick to answer and super helpful. We had a wonderful time in Istanbul - we would love to stay with Özgür again.