There are a lot of what ifs here Harry.
Are your guests people that can defend themselves?
How secure is the apartment, easy to break into or not so much?
Is the access to the apartment visible to you from your house?
Do you have dogs?
It is hard to really make an assessment without further information.
One thing that comes to mind though with your situation with the long driveway. I would definitely get a driveway alarm. You might also harden up the door to the apartment, maybe a fence and some cameras. You can do a lot depending on how much money you want to spend. A couple of years ago I hardened up the door to my bedroom considerably.
Are your guests people that can defend themselves?
How secure is the apartment, easy to break into or not so much?
Is the access to the apartment visible to you from your house?
Do you have dogs?
It is hard to really make an assessment without further information.
One thing that comes to mind though with your situation with the long driveway. I would definitely get a driveway alarm. You might also harden up the door to the apartment, maybe a fence and some cameras. You can do a lot depending on how much money you want to spend. A couple of years ago I hardened up the door to my bedroom considerably.