I really emjoyed in Plovdiv Downtown. For me it seems like it’s such a small, nice town, nothing like 2nd biggest city in whole Bulgaria. I really liked it! Our tour guide was Adi, nice girl and a great tour guide.
P.S. Don’t trust to the people in Tourist info center if they say there is no free walking tour. They tried to sell me regular tour by telling me the free walking tour issn’t active anymore.