Wonderful location and appartment, right in the centre of Kadikoy, with lovely stores, restaurants and bars all around you. The apartment itself offers everything you need, with no frivolities. Basic, but really all you need/want is there.
The one downside is the nightcub located directly underneath it and which is very loud untill 6 in the morning. Roberto did offer help, and tried to remedy the situation best he could, but sdaly not too much could be done about it. If you're there for the nightlife, it's not an issue, otherwise I'd recommend bringing really good earplugs.
Having said that, roberto is a really ncie guy, who does his best to help out, and it can not be overstated how nice this location is. It really shows you a more authentic side of Istanbul, is close to the waterside, metro and ferrystops, right in the epicentre of a lovely neighbourhood.