I know Katowice very well (shall be there this week-end) and I can tell you that most people there are very poor (most of them make more around 1,000).
This statement proves that you DO NOT know Katowice at all!
i`ve been living here for more than 20 years and i DO NOT know anyone who would earn around 1,000 !!!
The average salary in Katowice exceeded 5,000 PLN gross/month, which has been mentioned in public TV last time, and this is the highest salary in Poland (second place for Warsaw with gross salary about 4,600PLN/month). it is true that most people do not earn that much (it is the AVERAGE salary) but on the other hand, i have not heard so much complaining about the salaries from my friends. Even during the internship i earned far more than 1,000 gross, please stop bullsh*tting and keep in mind that Warsaw is not the only one place in Poland to make a good money. And for the whole region - Silesia - the average salary is second highest in Poland, after Mazowieckie, and recently exceeded 4,000 gross.
i agree that Katowice is not a dream city but this is the biggest construction site in Poland and is changing rapidly offering more and more to its inhabitants. People are very nice here, the infrastructure is well-developed, the quality of live is quite high.
And referring to the topic, yes, 7000 net would be comfortable in Katowice as well as anywhere else in Poland.