Polish is the official language, however English is widely (and fluently) spoken in central Kraków.
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Krakow is generally safe to walk at night, especially around the city center and popular tourist areas which are well-lit and patrolled. Like any major city, there can be isolated incidents, so being alert and conscious of your surroundings is advisable.
Citizens from the U.K., the U.S.A., Australia or Canada do not require an entry visa for Poland for short stays (for up to 90 days in any 180-day period in the whole Schengen Area) for tourist or business purposes.
Four days in Kraków is enough time to explore the key sightseeing districts in the centre of the city and to head out of town for at least one day trip. This is the ideal way to make the most of four days in Kraków, as it offers the most flexibility.