How do I format it? The room number the place I’ll be staying at is formatted as “123-1”, so do I write it exactly as that? Do I have to add anything to it like 号?
And when registering my address, does it have to be in kanji or can I write it in romaji?
From my search, it goes (with 123-1 as room number):
Building name
〒111-1111 Tokyo-to, Shinjuku-ku, Kabukicho 1-11-11 123-1
by zywx2842