Mariana is a fantastic guide. Full of knowledge, she is happy to share, ranging from the history of Viseu to what and where to eat in town.
We (my wife and I) had a lovely tour with Mariana, starting in the cathedral, realising the roots of the architecture woven into the stories of its past, the intrigues and the role Viseu played in Portugal's history, then to the market, to Rossio, and to a surprise encounter with a top-class chocolate artisan shop.
All in all, a fantastic few hours, with lots of new knowledge about this beautiful town.