The best cheap travel option available in most part of the Europe region is by Flix bus. If you do a proper plan you can just buy the 5 route coupon codes from Flix bus website costing just 99 Euros.
With this you can plan any direct journey complete the 5 destination like I did:
Paris to Venice to Rome to Pisa to Milan to Paris
This will cost 300 plus euro for sure if you travel by break …but I travel these locations with just 99 Euros and with perfect time margin.
Start from: https://goo.gl/maps/iYBrppyVSs62