My wife, kids and mother-in-law stayed at Hatice's place for a week and had a very pleasant experience! The place is exactly as shown and is a cozy apartment that is very comfortable. The view of the city is stunning and we loved seeing Istanbul at night, or at sunrise/sunset.
One thing to note is that the building is located on a very steep hill. And we stayed on the third floor, accessible only by a narrow and winding staircase. So if you have a lot of luggage (as we did), then it will be a serious workout getting everything up and down.
The location of the place is really great: a short walk to the main tourist street and the Metro station is just a short walk away.
Small (very minor) Areas of Improvement: we ran out of toilet paper and because it was the weekend (her maid wasn't in), we had to buy our own. Also, you can't drink the tap water, so Hatice provides a 5 gallon jug of water. But when it runs out, she will order another and you pay for it (it's a small cost).