How stable are digital multimeters' parameters?
I expect your multimeter is rather more accurate than the grid voltage.  Grid voltage can vary widely from the supposed nominal value.  At least 10% should be assumed off the top, but more should not be surprising.  220V +-10% is 198-242V, so you're within spec.  There are places in the world I would trust the power less than others, and frankly eastern Europe is in the second tier.  It's not as bad as some places where outages are common, but more than 10% variation shouldn't surprise anyone.

Then there is the whole EU standardization attempt.  Various countries had somewhat different power voltages, like 220V, 240V, etc.  The EU wanted to standardize this.  But instead of actually changing the voltages they just re-defined nominal with enough slop so everyone was within spec!