I lived in an apartment with my girlfriend for over a month. A very nice quiet area with excellent infrastructure: a large shopping center across the road, a market, cafes, bank branches within 3 minutes walk, 10 minutes to the park and the embankment.
The apartment is well prepared for a long stay: everything is very clean, plenty of storage space, a complete kitchen, fast wi-fi.
It is also very convenient and fast to get to the historic city center - 15 minutes by train and you are in Sultanahmet.
The hostess is very polite and responsive.