The highlight of this location is the location. While other reviewers may have not enjoyed the particular neighborhood it was situated in, it is within walking distance to Sultanahmet square, the blue mosque, the Hagia Sophia, the Grand Bazaar, and other historical locations. The neighborhood itself is a poorer area, somewhat run-down, and can get noisy. This was not a concern for us and we were able to navigate with relative ease.
Unfortunately, it's clear that the photos used in this listing somewhat mischaracterized the nature of the apartment; it is a very small studio apartment. The walls are blue--very blue. The photos make the apartment seem larger and luxurious when in reality it was a very basic studio apartment. On a higher note, the bathroom was very spacious. My wife perseverated over the shower ad nauseum.
The apartment is, for whatever reason, cleaned daily. For us, this took some of the fun of renting a full apartment out of the experience as we had someone clean the apartment everyday. While this may seem like a positive, we also had no option to increase our privacy as with hotels and the "do not disturb" sign. She also would come at inconsistent hours. Often times she would come at around 4-5 PM after we had already come in, tired, from a day of shopping at the Grand Bazaar, or wandering around Topkapi Palace. While she was pleasant, she spoke not a word of English making communication almost impossible.
Other side notes include, the kitchen being very small. There is no oven. The balcony is very small as well, so small it feels cramped if two people are sitting on it at once. There is no elevator so be prepared to carry luggage up 3 flights of very narrow spiral stairs.
Overall, the stay was a positive experience because of its location in Istanbul. The neighborhood is inhabited by locals which can either be looked at as a positive or negative depending on your comfort level in foreign countries. Don't expect luxury when you visit this apartment and keep expectations tame.