We used Dubrovnik Apartment Source and they were fantastic!!! I spent hours searching online and in guidebooks before I found them. We had a group of nine and we needed a driver as well. They are incredibly service-oriented. They recommended wineries along the way to Dubrovnik and sent us a list of their favorite restaurants, shops, bakeries, etc. for our time in Dubrovnik. It is run by a couple and they were wonderful. I only wish we had found them sooner. They were not listed in our Fodors book.