krakow is a great place to stay, unfortunately its a bit cold there at the moment so you wont be able to enjoy it as much as you would in the warmer months, where they often have big shows in the main square, and all the bars and restaurants are outside seating, theres usually a lot of americans there and all shop/bar staff speak english in this city, although they dont cope well with scottish accents so may make no difference to you lol.
If youre making your own way to Auschwitz from krakow just remember its Oświęcim you want to go to, Auschwitz is the german name, its a very short bus drive from the station there and the driver is used to telling tourists where to get off, get there early morning, it takes a long time to see everything, theres some very interesting stories and pictures in the old polish army barracks which was the original Auschwitz before they built birkenau, and it takes AGES to see it all, you will come away absolutely hating German people.