Great experience. Our guide, Bart, was a fountain of knowledge, professional and on time. So much better than driving ourselves. From Trieste we saw Rovinj and Grisignan one day and then Postojna Caves, the castle, Ljubljana and ending in Zagreb the next day. Bart knew a perfect viewing spot where we could see 3 countries (see photo). Custom private tour is the way to go. Would highly recommend their service.

Neal, Rhode Island, USA