Originally Posted by
seegs
Where would we refund the Suica card to receive the deposit back?
Go to the ticket counter of any JR East station.
Originally Posted by
seegs
How do I figure out which lines we can use it?
It's valid on almost all subways, JR lines, and buses. You can also use it in some vending machines, taxis, convenience stores etc.
Originally Posted by
seegs
We are staying in Roppongi but I do not see that station on the map on the website.
Roppongi is served by several subway stations. No JR station.