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.
But if it's an unconditional guaranteed income, i.e. each member of the family is making it, then it shouldn't be a problem. For example, a single mother with two kids would get her 500 EUR/month plus 500 EUR/month for each kid, bringing in a total of 1500/month for the family. While this certainly isn't massive, with a part-time job and being frugal, it should enable her to pay the bills.
Also, you don't have to live in the most expensive part of the most expensive city... Good livable apartments can be had for 300e-400e/month, even in the larger cities.
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.