Home directory viewable from another profile

[AG <computing.account@googlemail.com>]

Hi

I have created another account for someone who will need to use my 
computer for a while.  However, when checking this, I found that my own 
files are viewable from this second account.

How do I set the permissions so that the contents of my own /home/ag 
account are not viewable from the new user account?  For obvious 
reasons, I want to be careful about the permissions I set so I don't 
lock myself out.  I think that it is chown 700 /home/ag -R but can 
someone please confirm that this will do what I want before I screw 
things up.

Many thanks

AG