We had a wonderful stay at this apartment. First of all the location was perfect: centrally situated, very close to public transportation, Galata port (a very lively area with restaurants, shops and great views), Taksim Square and charming little cafes and breakfast spots. At the same time, it felt quiet and private since it overlooks a park. The views of the Bosphorus and the Old Town from the windows were amazing. We would just open the curtains every morning and take it all in.
The apartment looked just like in the provided pictures: very clean, well equipped and every thing was in working order. Ismet was a very responsive host, answered all our inquires right away, arranged for transportation to and from the airport, and even stocked the fridge with water and had coffee available, which was much appreciated since we arrived late at night.
Note that the area around the apartment is very hilly (part of its unique appeal and charm) and the apartment itself is on the second floor with no elevator. We did not mind this at all, including my elderly mother - what better way to burn off all that delicious Turkish food - but it's something to keep in mind of you are a person of limited mobility.
Overall I recommend this place enthusiastically!