University education always costs money - whether at home or abroad. Alongside tuition fees, initially a complete basic requirement of books and material is needed (i.e. a computer and office equipment) and perhaps an apartment with the necessary furniture.
Then, of course, there are the costs for insurance, clothes, food, trips back home, leisure time etc. For accommodation you should calculate 300 to 600, depending on the town and on the flat or room itself.
The Dutch ministry expects the following monthly costs for 2018:
Here you can find more information on how to finance your studies.