Travel / Information on Gliwice needed [41]

Merged: Moving to Gliwice for a year

I am new to this site. Greetings.
I am from Greece and I 've been accepted by a company in Gliwice to work there for a year as an Erasmus Intern.
I am flying from Athens to Bratislava next Saturday 26-9-15.
My job will be near Jana Sliwki.

I would like some basic information about the city and the country. For example:
Which mobile network do you suggest for me?
What are the average rents in the city and which areas are good to stay?
Should I find an apartment before I arrive or it will be easy there?
Any site that I can book train tickets online? I am interest in the route Bratislava-Gliwice.
Or any alternative way to do this trip.
How good is the public transportation int the city? Where can i found route information?
Any swimming pool, hiking club or similar activities?

Sorry if I am asking so much. Any information would be great.