Thanks everyone!
I'm just about to make the decision because I feel I need to get this part of the trip sorted. We'll be driving there so we need a parking space. I've sent off queries to hotels so hopefully I can sort out our accommodation soon.
It's part of a little driving holiday - more of a pre-trip to come back and spend a bit longer next time if we like it. We might not have time to see Bled etc this time but it's definitely planned for our next trip.