Walk out of the Gotanda JR station through the East gate. See behind the bus area on the opposite side a small street between Yoshinoya and Ringer Hut. Walk that street for 30 meters until the first intersection. You have arrived.
Chinese girls will prowl the area from around 8PM. They'll find you.
Chikan G and Maruhi Densetsu are in that area...ahh memories..