Personally, I really liked Istanbul a lot. I enjoyed the Byzantine cistern. It was kind of interesting looking. The old palace is beautiful, but you need a lot of time to see it. I enjoyed Hagia Sophia. The food was awesome. I liked the Galata area and walking around there. There are just so many things to see. The Taksim area can be quite busy during the weekend and bustling. The European side can be crowded, but the Asian side isn't. It's not really a tourism area.