I have spent a year and a half in Dijon, and I feel quite satisfied with the public transport ! The network Divia (the society in charge of the transport in Dijon) offers a lot of possibilities (tramway, bus) that works, places that are actually clean and safe (never had an issue in it) and that is also accessible for young people, with not-so-high prices (many choices for passes - hourly/monthly/daily/groups etc.) Well, the app isn't the best one on the store with soooooo many bugs, but that's quite it !