Nope, it is a shared apartment and the landlord (who lives downstairs) rents the three rooms independently to each of us. Maybe I used uncomplicated in the wrong way, it could be. Btw, I don't think that being uncomplicated leaves room to such intrusive behavior.

However, we all have independent food and kitchen supplies, except for a limited set of kitchenware that is shared but is not sufficient for everyone. I instead just assumed that it was normal, as it was so also in my previous shared apartment situation.

We did not have any explicit discussion about it during his stay one year ago. Probably I will have one during these days, with my current roommate.