ICARO is a neighborhood in Meguro Ku, Tokyo. 2 YouTube travel vloggers — including Cakes with Faces — have covered it across 2 clips.
Ikebukuro is a train hub connecting to Shinjuku and Shibuya.
“it's really quick to get between Iikaro, Shinjuku, and Shibuya on the train in as little as 11 minutes if you take the psycho line.”