You bring so valuable in a shared flat (laptop, cash, etc.). And in principle they are strangers, with whom one pulls together.
Namely, if you steal your heart & breaks you.
You have to get to know people better! First of all, leave your valuables to others if you are unsure. And if you got to know them better then you will surely know if you can leave the valuables in public areas.
During my studies I lived in a shared apartment with three others and we all got along well and could trust each other.
/ m + / w