I had a great experience in Kaya's apartment. It's really good for its price (one of the cheapest ones in the area), arrival was great and Kaya was really helpful. It's also in Kadiköy, which has become the coolest part of Istanbul, and really close to Moda. If you're going to Istanbul, I really recommend you to stay in Kadiköy and visit stuff from there, instead of staying in the area of Taksim, which is far from what it used to be. I will be happy to stay again in Kaya's apartment when I come back to Istanbul and recommend it to everyone!