Hostel STEP is located in a quiet suburb of Pula - Štinjan. Once you get to Pula, local buses driver every half an hour to Štinjan. There are many taxis service as well...
From the main (and only :)) airport in Pula, you can get a bus to Pula, that drives on regullary basis or grab a taxi.
Follow the signs for Pula / Stinjan / Fazana, and at some point you will see Hostel Step sign :)
You can book a bus tickets at a discounted rate via following form.