@Sharon2158 Most of the single-family, unattached homes that I have stayed at have had driveways that will allow 1 or 2 cars to be parked on the drive and the garages have been locked as owner only areas.
When the property has been part of a condo or apartment type complex where overnight street and driveway parking is "forbidden" due to HOA rules, the garage has been made available to the guest.
If your driveway will accommodate guest vehicles and overnight parking is permitted, then I see no reason for allowing garage access.