The easiest way to find out the path to the home directory associated with your username is to log in to the User Management System (OMA- service) at https://account.jyu.fi/
You can see the home directory path under the "Username and Email"- tab:
Check the directory path in "Home directory location".
There is no need to find out the physical path of the W disk as it is always a format:
smb://karahka2.cc.jyu.fi/username (the smb: start is required for the Finder's Connect to Server command)
In the Macintosh Finder, under Connect to server in the Go to drop-down menu... you have to put smb: at the beginning of the file path, and the backslashes "\" in the path name have to be changed to slashes "/" on the Mac.