Studio apartment
All depends. A small kawalerka (bachelor flat) in the citry centre (20-25 m2) may run 1500 to 2000 zł. There are upscale suburbs like Wilanów and low-scale semi-rural ones like Babice so rental may range from 1000 to 3000 a month. Food costs dpeend on whether it is home-cooked or catering/take-away fare. Perhaps from 500 to 1500 zł. Utilties perhaps 500-1000 zł. This is just a very rough estimation because so many different variables enter the picture. Other money-gobblers depend on one's lifestyle. Entertainment, travel, shopping, etc. can be quite pricey.