My wife and I stayed at Zehra's place for 9 nights. We aboustly loved it. It was a short walking distance 3-5 mins to the "Tunnel" subway ( the 2nd oldest subway in the world and it takes you to the start of istakal street) , and the tram 1 line is on the same corner( it takes you to all of the old sites.) The area is very quite at night since it is commercial although it may seem a little sketch at first it is very safe. The locals around are very friendly and helpful. Our personal favorite was Najir the local "chai" guy(runs a tine tea stall from the bottom of the building). Another great perk about Zehra's flat location was that it was very close to the green line subway station, which is located on a bridge over looking the golden horn and the Bosphorus river. The views are mesmerizing and are often overlooked by tourist. My wife's favorite views were from the rooftop terrace and the incredible views of the sulemayah mosque glowing at night from the windows in the flat. The flat was clean, and had everything we needed. The wifi was good. The only thing that could maybe use a change is the mattress it was a little to springy. ( or maybe even just adding a memory foam mattress topper). Overall everything was great and if we have to opportunity to visit Istanbul again we will definitely stay again.