We really enjoyed our stay here. We stayed for 3 weeks. It was the perfect location and our host was amazing - very fast with communication, helping us with our luggage and helping us arrange transportation. The apartment was a bit small for us (we had 4 suitcases) but felt cozy.
The washroom was also very small though and the water in the shower was not the best (turned very cold and hot initially) but manageable.
The location of the apartment is right beside Galata Tower, which was perfect because of all the food options around. However there is noise until late at night (which didn't bother us but may for some people) and the street is very busy.
Overall we enjoyed our stay and would recommend it for shorter stays!