Hi @Debra300 .
I'm a bit confused, as when you say that there's dedicated parking area in front of your guesthouse, is that area within the curtilage of your property, or on the road?
I can understand (if I've correctly read what you wrote) that you may well be differentiating between only your Guests are allowed to park in that area, as opposed to anyone being able to park in any other areas, but surely (and I'm not trying to split hairs here) on the road (whether free or designated) means "on the road" whereas within the curtilage of one's property (ie NOT on the road) is "parking ON premises"
Perhaps you do let your Guests know that the free parking on premises isn't actually what the phrase purports, but for anyone wanting the security of parking actually behind gates on a property, I know I would want to know.
Having said that, you might have your property in a very secure area, where your Guests' vehicles would be perfectly safe not on your premises, but something I've come to recognise over the years is that many Guests' live in far less safe/secure areas than ours, so cannot believe how lax we are with some things, that "terrify" them might happen if they didn't immobilise their vehicles etc!
Terminology is a funny thing, meaning different things in different places/Countries, but is also up to various interpretations, so sometimes needs extra clarification - just to be in the safe side (and I'm not saying that that spies to you for your listing, but just saying it because we all have to be mindful of how Guests - in particular - could so easy misconstrue what we are wanting to convey!
Hoping you're having a good season so far, and that you'll have a fantastic summer!