How to use iCloud Drive
Best Explanation of iCloud Drive found
To find the path to a file simply open the terminal (you can use the search tool), drag the file from finder in the terminal and it will provide you its path. This is however problematic with files in the iCloud Drive as apparently, the provided path does not work when trying to access it from other programs than the one it is registered with.
M is right; IF you have iCloud Drive turned on in sysPrefs, the iCloud Drive folder is there, he was just listing it relative to your user account.
I'm not sure about the "com.apple.CloudDocs" though. The com~ files & plists for everything, including mobile apps, are NOT visible in Finder -only in Terminal.
As of 10.10.1 if you're looking for the absolute path to the all-encompassing directory, try: