Teaching English In Krakow (Kraków)

Hi everyone. I am from London and I am considering moving to Krakow to teach English. Firstly, I would like to know what is a liveable salary in Krakow? How much to English teachers earn and is it enough to live in Krakow. For example, is it enough to pay rent and utility bills and go out once or twice a week? Secondly, I have read some advice on the internet regarding schools in this city. I have read some are not very professional and do not pay their teachers. If this is the case, can anyone recommend a good school in Krakow where the teachers are treated well and proper? Any advice would be greatly appreciated.