Is it possible to fully repay my mortgage loan after I sell my apartment?

Yes; however, this may be associated with some fees. If it corresponds to an interest rate renewal period, your early repayment is free of charge

What are my options?

Without any fees

Prior to an interest rate renewal, you may apply for an early repayment of your mortgage loan. This transaction is then not associated with any fees

With fees

Naturally, your mortgage loan may be repaid at any time; however, this will most likely be associated with a sanction