Can a minor dis-affirm the lease of an apartment even if it's not necessary?

Yes, a minor can disaffirm a lease for an apartment, as contracts with minors are generally considered voidable. This means that a minor has the right to cancel the lease, even if it is not strictly necessary, to protect themselves from being bound by agreements they may not fully understand. However, the specific laws regarding this can vary by jurisdiction, so it's important to consult local laws for details.