Not being registered at municipality for a stay longer than 3 months - EU
I would appreciate if someone could advise me on a migration question.
I am a student, recently arrived in Belgium. I'm an EU citizen and the law requires to register at the municipality within 90 days of arrival.
I currently live in an Airbnb, and my booking will expire in 3 months. I plan to stay in Belgium for another 6 months. The property owner offered me to stay at the flat, however she cannot rent it to me officially, neither she is able provide a justificative of domiciliation.
I am not planning to work nor interested in opening a bank account, however I am worried if any consequences or fines that might arrive in such situation. If I stay at my current residence and I do not open a file at municipality, what might be the fines or other consequences?
Thank you for your advises.