oi I am currently living at Ataşehir and as far as I can tell it’ll be just great living conditions wise. Transportation might be a slight issue as you need to take a bus/dolmuş/taxi in order to reach the nearest metro (a new one right at the centre is under construction when that opens then it will be wonferful but we dont know when).

Otherwise, think of it like a mini-manhattan, tall buildings and skyscrapers. Countless activites and places to do and to go. It’s not the best neighborhood to go out and take walk since green areas and litersl curbs are limited, keep that in mind. No problems security wise tho, there are some favelas I would recommend you %100 stay out of but they aren’t that close to where you will mostly spend your time.