I include this information in the "House Manual" and it is also part of my message that I send to them a day or two before they check in through the messaging system.
David
Superhost Ambassador ~ Host Club Community Leader ~ Experienced Co-Host
I have a very similar requirement - two small maps showing the exact location of the property and the location of the car space. The House Manual does not allow one to include graphics.
I add our when I email the guest - they always receive it - I embed the map pic into the email (I don;t use the site email function for that however as it won't allow you to)