We lived in the apartment for one week. Location is very good - 10-15 min to Galata Tower. Close to it there are a lot of cafes for good breakfast (my recommendation Papadopoulos Cafe). Tram station is very close too - 5-10 min. Communication was good, owner reacted very quick to our problems.
But there were also some downsides. Some kitchen chairs and shower in bedroom were broken, but owner fixed it very quickly. Light in the bathroom flasched. And we heard noises at nights, walls are thin.