I stayed in "travel bird" apartment for two night. Flat is not big but cozy and has all necessary equipment. Kadıköy is not quiet district. If you travel with kids it isn't you choice. But if you wanna bars, restaurants, night live etc Kadıköy might be right place. Transport availability is good. There are ferry port and metro/bus stations near. I managed to reach all location I need like Europe side, IST airport and even Bursa ✈️. So what was important for me, I didn't have any trubles in communication with host. I'm able to speak English only (not Turkish). Tugba answered in app all my questions fast and also helped me to find right door 😁 Thanks for hospitality.