Our family takes every Free Walking Tour in every city we visit. The tour guides are always knowledgeable, friendly and helpful. We learn so much. Not just facts, but also interesting tidbits. Plovdiv walking tour was great. Tsveta, our guide, made the 2-3 hour tour memorable and interesting. This was also one city where you do a lot of up/down hill walking on rock-lined streets, so be prepared with good shoes.