2 of us was very allergic against house dust/mites and therefore wasn't able to sleep in the beds. The allergic reaction was so strong that we had trouble breathing and had a running nose all through the night. We had to sleep on the couches in the living room without any sheets, which was the only way we were able to sleep. There is also this smell of old wood and "unrenovated house", maybe because it wasn't opened up for air for a very long time.
The location of this apartment is absolutely unacceptable. This apartment is not family friendly at all: it's located in a very hilly neighborhood - making it very hard to travel by foot, as we were unable to use the baby stroller. The windows and doors are very cheaply made and have almost no noise reduction. The apartment is also located at a harbor in construction and a school, making it very loud in the morning until evening. At night we had to listen to the sound of seagull all through our sleep. The handles of the balcony door was a hassle to deal with.
Don't get fooled by the "most popular district" lie. There were no real activity to do here, the streets were dirty and full of cats with only a few shops nearby. No taxi EVER found this apartment at first try, sometimes even with navigation. The next crowded place is Taksim, which is a 10min walk away up the hills.
The price tag of this apartment is absolutely too overpriced. It's the price of one of the best 5-star hotel suites in the center of Istanbul, also without any room service and with very cheap furniture. Definitely not worth the price, a reasonable price would be only one fifth of the price listed.