[doodaddy]

You’re only looking at the most recent couple of years. Going over the entire set and Tokyo shows up toward the top frequently. Having lived there for a short while I would agree - Tokyo is very livable. I think it’s because the city is composed of smaller “cities” and the concentration of goods and services is distributed among neighborhoods.

[pezezin]

I don't know, I have visited Tokyo many times (the last time was two weeks ago), and IMHO it is cool to visit once in a while, but I am not sure I would want to live there. The overpopulation, the cramped buildings, and the brutal weather in summer is not exactly pleasant for me. Not to mention that Japanese culture is very difficult for most Westerners to adapt to with its million rules; heck, sometimes it is difficult even for native Japanese!

That why I said that all these "most livable city" or "happiest country" indexes are very debatable.