Nargiz's place is the one of the best convenient places, I was in Istanbul for 3 months and had to stay in 3 different places, all uphills and downhills make you very tired but her place was best of the best. No uphills , markets and bus stop just downstairs, bosphorus 5 min walk, taxi every minute .
So I recommend to everyone her place.
And she is also helpful and communicative person