Cost of living in Venlo (Netherlands) is 12% more expensive than in Arezzo (Italy)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 29 prices entered by less than 5 different people.
For example, you would need at least €2,916 in Venlo to maintain the same standard of living that you can have with €2,600 in Arezzo.