We were very happy with all aspects of the tour. I’ve just posted about it on Trustpilot. We were especially happy with Catalin and Stoyan and how helpful and friendly they were throughout. We would definitely recommend the trip to others.
The only change I might suggest are to incorporate a visit to see the Buzludzha site into the Bulgaria itinerary, because it is a striking place and not a big detour. Otherwise it is a great tour!