Subway a lot of available in Tokyo. It is very useful, it is economical means of transportation.
Station near My office is “Sumiyoshi”sta. “Sumiyoshi” station have Toei Shinjuku Line, the Tokyo Metro Hanzomon. Access Shinjuku, Shibuya to do not need 30 minutes. This is very convenient in Tokyo. Access to the “Tokyo” station, is very good. Buy a free path of JR line, residents previously had to travel to Nikko, Kyoto and Osaka etc.