Location is superb if you dont mind walking hills up and down. The balcony is absoluty splendid (floor 4). Every evening at home (when the weather was nice) Ive been enjoying it to the fullest. Even in the most fine Istanbul you wouldn't find such a view!
I have stayed in for 10 days and never had any service done though they promised one.
There is no kitchen equipment, only the kettler. Make sure you ask for extra if you need anything for real cooking.
I invited my friends (married couple) for a glass of wine twice. Each time they were informed that there is "no guests" rule in the apartment. That was weird and annoying. Twice i had to get down and bring them up.
The lady and the owner seemed nice and ready to help when there was a question and/or request. Appreciated it.