Krakow is the bast place and dont lisin to people that tells You Wroclaw.
Actually, Google established their offices in Wroclaw for a number of reasons. One was a steady supply of highly qualified staff and unfavorable conditions set forth by Krakow officials.
A quote from Time Magazine:
Nowadays, the elegant old market square in the city center, once the site of a few scruffy museums, is lined with designer shops, sushi bars and restaurants. Companies from LG Philips (LCD screens) to Google (service support) have poured $5 billion into the local economy in the past five years, creating 200,000 jobs in a city of just 650,000. The mayor's office reviewed 560 investment projects last year alone. Since 2002, unemployment dropped from 14% to under 5%. Mayor Rafal Dutkiewicz credits low production costs, a good location near the autobahns to Western Europe and a deep pool of educated young workers: local universities graduate 24,000 students each year.
time.com/time/magazine/article/0,9171,1729145-1,00.html