Hmmm... Shinjuku and Roppongi at night... I don't disagree with the recommendation, but it would be misleading to tout them as "clean" and "safe"

These are two of the neighbourhoods where I would advise anyone to act with the same degree of caution that they would in, say, London or New York -

Stay away from places which don't publish their prices up front. Be aware that there are some people who want to fleece you. Steer clear of gangster-types and drunken military-types. Keenly observe the pavement to avoid stepping into someone else's dinner.

People can get a false sense of security after a short time in Tokyo - I'm not saying that these areas are "dangerous" - but please don't think that nothing can hurt you here.