If your salary is above the average then this means that you are not very far from the better half. read more
As Wojtek said — you can rent a nice place for 1 person for 1500 zł. For a family it would be up to 2000. Food - if you cook at home, you can live on 800 zł for food. read more
You can live for 2k per month, but 2.5-3k to be comfortable. Everything over that is a bonus. For comparison - entry-level programmer (usually still on 5th M.A year) earns 2-3k in Lublin, entry level accountant or analyst - 1.8k-2.5k. read more