We enjoyed our time in Istanbul at Dilek's place very much. The apartment was perfectly clean, cozy and well located. The neighbourhood was amazing. If you want to explore Istanbul, this is the place to stay. The main road of Beyoglu is nearby, you find lots of fancy bars and restaurants (which are still very cheap) around the corner and nevertheless the street where the apartment ist located is not that crowded.
Moreover she always asked whether we were fine and gave us some nice advices, where to eat and where to go. Teşekkür ederim ;)