Overall satisfactory apartment. Smaller than we expected (it was 40 SQM, and only one bathroom). However, for a group of 4 who spent most of the day outdoors, this was sufficient.
Location is fantastic and is 10-minute walk from Taksim, Sultanahmet, and a 5 minute walk from local Tram/Train links, and the Ferry station at Karakoy.
Overall, satisfactory; however, if you do have some extra funds, you could perhaps get a hotel.