My home is located in the heart of Sinchon, if you want to feel the vibe of youngsters, here you go. It takes 7 min. from Hongik university (a.k.a Hongdae) station, & Sinchon station. Many buses For Myeongdong, Gyeongbokgung Palace, Insadong, & Gangnam,
Hyundae department store, big supermarkets & all Korean cosmetic brands are in Sinchon main street.
Why don't you try delivery food like locals! Seoul is heaven for delivery food. My home is so convenintly located for all these.