One of the things that can be very confusing when navigating Tokyo is the fact that addresses here are not exactly helpful. This explains why cell phones with web access (and thus Google Maps) and why taxis all have GPS standard. Here:s a video that explains what:s going on:
This also explains why one of the best challenges I saw on The Amazing Race had the competitors required to deliver an item of dry cleaning to an address in Tokyo. IMP-ossible!