Kyoto, the ninth largest city in Japan, and Osaka, the third largest city, were also very clean. Here are the reasons I think these cities are so clean: The homeless population is very small (percentage-wise) There are no public trashcans.
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Kyoto is more relaxing. Tokyo is about 30% more expensive than Kyoto for travelers. If you prefer big cities, modern technology, nightlife and a huge selection of restaurants, Tokyo is for you. If you're after temples, shrines, garden, geisha and hiking, Kyoto is for you.
When traveling in Japan, especially if you're in one of the big cities such as Tokyo, Osaka, and Kyoto, you'll generally have no problem not speaking Japanese at all. There are usually English signs all over train stations and airports.
Confucianism is one of the fundamental ideas of Japanese politeness. Confucianism stresses loyalty, justice, sense of shame, refined manners, modesty and honor among other values.
Japan has earned a reputation as having some of the lowest crime rates in the world, both theft and violent crimes. While the Yakuza, Japan's organized crime syndicate, often plays a role in movies, they are not likely to target tourists. While in Japan, simply exercise common sense and don't make yourself a target.
London also feels less crowded and you can breathe more easily. It's also cleaner than Paris. Also, while both cities have very old Metro systems, London's feels safer less creepy.
Kyoto is generally a safe city, and most areas are safe to visit at night. However, as with any large city, it's always a good idea to be aware of your surroundings and to take precautions to ensure your safety.