Sorry for asking this but what do u think would be the total cost of a young couple of 2 living in Poland Lodz?
On top of rent, 2000 PL per person will be enough for modest cook-at-home food, routine and occasional household supplies, modest clothing, occasional cheap or mid-range meals out, modest weekend entertainment, very occasional budget travel inside Poland, and enable you to save a rather modest rainy-day fund. Even on 6000 PLN a month net and paying only 2000 PLN a month for your apartment, serious saving is out of the question. Life $ucks if you can't put away a decent amount per month in savings. This is going to be the biggest existential problem you face, and the most likely reason you will eventually pull up stakes and leave Poland.
Like I said, not poverty, bur fat from the high life. That is why I advised you to greatly reduce your spending on accommodation. 2800 is extravagant.