Krakows airport is now under construction and the shuttle train to town is no longer in service. If it is not a taxi (trip costs around PLN 70, which is c. 18 euros) take a bus no. 208 or 292 to the main train/bus station.
From there (tram stop Dworzec Glowny), we suggest you take a tram no. 79 (with direction Dajwor), get off at third stop called Miodowa, and turn right into Ulica Miodowa and proceed to number 28. You can buy tickets from machines inside a tram, and just remember to validate them.
Walking from the train/bus station lasts approximately 15 minutes. You need to get to the underground passage situated in front of the main train station building. Leaving to the left, take Ulica Westerplatte and get to the big Post Office building, then take a left into Ulica Starowislna (not to confuse with Ulica Wielopole), cross Ulica Dietla and straight along Ulica Starowislna get to Ulica Miodowa. Now you only need to make a right, we are at number 28.
Taxi stands are located above train station platforms, in front of the bus station building, or in front of the shopping centre. Expect to pay not more than around PLN 20 (c. 5 euro).