Booking.com's emails have several quirks when done with Japanese hotels:

1. There is no indication of the country
2. The address contains the hotel name twice: once Romanized, once in Japanese
3. The address has two fields (one Romanized, one Japanese)
4. The order of the Japanese addresses is different

This is somewhat a hack, but the booking.com emails are not structured
enough to extract the information.

Tested a Japanese reservation HTML from booking.com, worked. Tested a
non-Japanese reservation from booking.com, worked.