Finn here. Some figures to put the floated numbers of 500-1000 euros/month in perspective:

Average salary, before tax: 3150 EUR

Average salary, after tax: ~2000 EUR

Market rent for one bedroom apartment in central-ish Helsinki: 1000 EUR

In other words, 500 EUR/month is a tolerable budget for a skin-flint student living in subsidized/free accommodation, but it's going to be pretty tough going for an adult, and completely prohibitive for eg. raising a family. 1000 EUR would be more realistic, but obviously also twice as expensive to implement.