+1 Adriatic Mototours
They are also known as SMTours. My wife and I have ridden with them twice and we also did a self guided tour once with their help and their bike. Matej's people offer outstanding service. I'm NOT a tour or group rider, but they are different from the typical tour operator in many good ways, so we're going with them again in AUG 2103 - this time we are using our own bike.