1- I have asked from 1400-1500euros (net) per month. Is this a good salary in Poland?
It's OK for Kato, but depends on what you do. Ask for more, they obviously want you...plus are you an employee or a contractor?
2- What is the cost of a house/appartment rental in the city center per month?
Depends on the size and if you live alone etc...budget for 1000zl if you're gonna live alone...but that would be a pretty cool apartment. On a budget you could get somewhere for 600-700zl
3- How is Katowice?
Kato...is...well...it takes a bit of getting used to, It ain't Paris. It's industrial but there's a decent music/arts scene too. You get a lot fo foreign Med students around Ligota and of course there's the usual TEFL teachers, but not so nearly as many as in the bigger Polish cities like Warsaw, Krakow, Wrocław.
4- Do polish companies usually pay a 13th and 14th month in the year?
AFAIK, no....but I'm on a contractor contract..not an normal employee one...but I reckon it's 12 months of pay.
5- Are there good looking shopping malls in Katowice?
Yea, there are loads. Katowice is one city among a conglomeration of 13 other cities/towns. Total urban population is around 2.5million, ,so yea, there's loads of shopping centres around.
6- Just out of curiosity how much do Doctors, Veterinarians, Dentists, Teachers earn in Poland?
No idea on this.....although if you're an English language teacher you'd prob be on anything from 2500-4500 per month, depending on your qualifications and how many hours of torture you're willing to do
If I can give you 2 pieces of advice before coming here...
1) Driving license. Katowice...indeed Poland is huge, you'll need a car. Public transport runs on time for the most part (except trains), but the service is crap and the trams and buses can be extremely cold (if they aren't new) and about 50% of trams/buses are the old one
2) Take up a Polish course. It's not like Krakow/Warsaw etc....where many people (under 30) can speak some English. Katowice doesn't have a history of tourism so many...indeed...most people do not speak English. OK, your colleagues will prob speak English, but I can gaurantee you that the people you'll need to meet, post office, bank, tax office, local shop, Tesco etc will not speak a word of it.
Hope that's helpful, if you've any questions send me a private mail :)