Location is in Shin Okubo, which is the Korean District in Shinjuku. Lots of Korean influence in the neighborhood. Tons of restaurants, shops, markets, etc. here. It is a 4 minute walk from the Shin Okubo station from the JY line. However, there is also a crowd and it can get difficult to walk from the station to the Airbnb during peak hours.
Otherwise great stay, with everything you need!