Shelter of the Polish Society of Youth Shelters. Most often they are organized in school buildings or modest shelters with camping sites. They are the cheapest and most popular form of organizing cheap accommodation for young people, especially for school trips. But to this day, PTSM may also be used by seniors and use their services. There are four shelters in Krakow: Przy Oleandry st., Koćiuszki st., Szablowskiego st. And Stawowej st.