Yumiko was a great host - Very accommodating and responsive. She answered me when we had an issue at 12AM!
Apartment is VERY spacious, however the in home WiFi is not the best - Bring your own WiFi if traveling from abroad.
Neighborhood is in Koreatown, but far enough from the main strip for it to be quiet. Very busy street during day time, many restaurants and bars.
Public transit station: Shin-Okubo or Higashi Shinjuku are both within 10 minutes of walking. Overall I recommend this airbnb!