On linux machines /home holds all of the user accounts; so if my username was "gremelin" my home directory would be /home/gremelin
The /home/username directory is usually "hidden" from FTP sessions; it'll just show as /.
Your best bet is to go look at "paths and urls" in the control panel and noting the full directory as this will show what the directory is according to the webserver versus your FTP client.
