What’s the least amount of money that would significantly improve your life?

Probably something like... €400.000 to €450.000. Then I could buy an apartment or small house when I graduate and pay off my student loans in full. It depends on the city I can find work in and want to live though. There are 3 I'm seriously considering and it varies about a €100.000 for a house between the cheapest and most expensive of the three.