We had a great stay at this apartment - the location was good for us as it was close enough to shops, walking distance to restaurants and main street as well as metro. It is on a quiet street tucked away behind the centre. You do have to walk up some steep hills, but this is like anywhere in Istanbul, and the apartment is on the 5th floor with no elevator, so more steps!
The apartment itself is beautiful and we had enough space for 4 girls - only thing is, there is only one small bathroom. We didn't find it too much of an issue, the only thing that would have helped with getting ready is having a mirror in the apartment! The apartment looks like the photos, it was clean and has all the equipment you might need for a short stay. There was aircon in the living space, one bed room, and the other has a fan/ AC which was fine for us.
The host was extremely helpful in letting us store our luggage on the day we had to check out as we had an evening flight.
The balcony was also a nice extra, and overall we had a great stay here. Would definitely recommend!