Good introductory tour to the Balkans. Need a bus-seat rotation plan to prevent some passengers from hogging the good seats. Choose buses that provide USB charging ports. Avoid less organised hotels where coffee and food runs out, such as in Hotel Marinela in SOFIA and Hotel Panorama in Veliko Tarnovo. Choose hotels that serve breakfast early, at least at 7:00AM, e.g. Panorama in Veliko Tarnovo serves breakfast only at 7:30AM and tour leaves at 8AM, not enough time. Choose hotels that provide express-laundry services as we do not have time to look for laundromats elsewhere. When arriving too early at a city to check-in at hotel, do not waste time unloading bags first, directly go on city tour then come back at check-in time. Maybe reduce a day from Bulgaria or Croatia and add at least a day more in Serbia, which is rich in history. If possible design a new tour to cover all Balkan states and add Montenegro, Kosovo, North Macedonia and Albania.