Like it. The ticket price is 1190 liras. The entrance is not in a high-rise building, but in a shopping center (Moll), you need to go down on an excavator near the Lacoste store to the floor (or two, I did not remember for joy) you will see an entrance with a gray sign
March 2024 cost 1120 liras (!) for tourists, very expensive. I had to go, because I did a difficult job to get there. Of the cons: there are no signs of how to get to the aquarium, there are a lot of signs, there are no signs to the observation deck. As soon as you enter, you need to go to the 1st floor, and look for the information desk (opposite) Lacoste (it seems that you still need to go on the escalator), and already there they will tell you where to go. It's very confusing. Nevertheless, I really liked it! Istanbul is beautiful in the sunset sun :)
The view is simply breathtaking. The observation deck is located on two floors, there is a glass floor on the open floor. There are not many people on weekdays, which allows you to make simply amazing shots. I advise you to visit at sunset, at this time Istanbul is the most beautiful