You live in Poland? Country or City? Google estimated a 60 square meter 2br condo in Warsaw costs an average of $260k. So a $240k bonus, after paying taxes, leaves you with $145 in Poland, so no, you could not likely get a condo in Warsaw with a $240k bonus. I'm sure if you live well outside a major city that changes.
And, the bigger point is, even if you could afford a house, is that life changing? Would your life style change because you bought a house? Or, would it just basically be the same life style as before except you now own a house?
To me, life changing amount of money means an amount that changes my life style. That could mean, an amount that lets me retire and never work again. Or an amount that lets me quit and start my own company. Or quit and go back to school. Or quit and travel for a few years. Something alone those lines, having my "life change". Buying an apartment but having my life remain the same, same job, same hours, same activities, is not "life changing" to me.
I fully admit a $240k bonus ($140k after taxes) it could be life changing for others. If I'd been 19yrs old when my living expenses were $20k year, then $140k in the bank would have let me go ~7yrs without a job. Unfortunately my 19yr old self would have probably blown 30% on a car, 20% on travel or other things, 10-20% on random equipment like a new gaming rig or cameras and lens and then in a few months I'd be back where I was. And, even if I did manage to not blow it and do the 7 years, what else could I have done. Could I started a company and hired people? How many could I afford to hire and for how long? Would it be enough to not just lose the money or would have needed more than $140k?