Takarajima 24 Uguisudani

Cheapo Article: Takarajima 24 - The Internet Cafe that REALLY isn't
Area: Uguisudani
Access: 147 m from Uguisudani Station Yamanote Line (JY6)Keihin-Tōhoku Line (JK17)
392 m from Iriya Station Hibiya Line (H18)
392 m from Iriya Station JR Sagami Line
Address: 2F-5F TC Dai 14 Uguisudani Minamiguchi Bldg., 1-2-21 Negishi, Taito-ku, Tokyo [map]
Phone: 03-5603-1180 03-5603-1180

One of a chain of internet/manga cafes with private rooms. This one is located near the south exit of the station.