This place is much better than what the official pictures shown. First of all the apartment is spacious with a beautiful sea view. You can simply lay on the sofa in the living room and watch the marmaray sea and sky changing from sun rise and sun set. Its location may seem far from the tourist centre (sultanahmet square or taksim) but it's easier to go everywhere within 30-40 mins - one or two public transportation connected line and walk.
The apartment is well finished with everything you need for a living. The kitchen is filled with plenty of kitchenwares and all the machines works well. You can prepare your meals at home easily, just ordering a take out from many restaurants or buying fresh grocery nearby.
We stayed in the mid winter and had the heaters in every rooms. The bed in one bedroom maybe a bit small for 2 people but you can sleep on the mattress or a sofa instead (which was fine to me).
The hospitality of the owner (Resul's sister) is very nice although she speak a very little of English. The check in and check out process is easy because the owner come to see you personally and guide you through everthing in the house. Also we can leave our luggages at the house even after check out time and collect them later before leaving to the airport in the evening.
Overall, we're very pleased to stayed here. It was like we've stayed at our relatives's house because it was so comfortable and got the vibe that a real, living house should be. We will definitely choose this place again if we're back to Istanbul.