• Plane
  (~50 mins from Helsinki airport)
• Train
  (~5 hours from Helsinki railway station)
• Bus
  (~6.5 hours from Helsinki bus station)

There are daily flights from all over the world to Helsinki airport.

Downloadable, printer-ready map of Joensuu in pdf-format. All necessary places are marked on the map.
Download/see map here

You can gather more information from
Joensuu guide