Tokyo is a metropolis, in the official designation. Prefectures are 県 (ken) and Tokyo is the one and only 都 (to).

Would and have. A few times.

I can say the grass is always greener on the other side, and people are mostly the same no matter where you are.

I like Seoul, but I liked Tokyo just a bit more. I recommend it if you get a chance. But like any city that big, your mileage may vary based on what you actually do and see.

I didn't live in Tokyo, but I did live near it for a little while. It was beautiful, but I'm a bit glad I wasn't in the city all the time. Just too much going on for my tempo.

Pizza margherita is pizza margherita. American cheese pizza is pizza quattro formaggi.

Source: Italian.