Can I cancel a signed apartment lease in Greece if the landlord hid mold and refuses repairs?

Yes if there are serious problems for which the landlord is responsible and for which u were not clearly informed when u rented, u can cancel the lease and ask the deposit (guarantee).

Generally, serious undisclosed defects that make the property unhealthy or uninhabitable can allow the tenant to terminate the lease early without penalty, reclaiming the deposit (if undamaged otherwise), further claims also for possible moving costs or other compensation may also apply. However, at times success depends on proving the defect's severity, so outcomes vary case-by-case. Finally, for the proper stategy and evaluation of the case a review of the relevant documentation is needed.

Dear Sir,

Thank you for your message. We have reviewed the circumstances you described regarding the undisclosed mold and dampness in the leased property in Athens, as well as the landlord’s refusal to address the issue despite written notifications.

Under Greek tenancy law (Α να εν περιπτωσεις) the landlord is obliged to deliver and maintain the property in a condition suitable for its agreed use. Serious mold, dampness, and related health risks constitute a material defect and a breach of the landlord’s maintenance obligations.

Based on the facts provided, you may have the legal grounds to:
1) Terminate the lease for good cause due to the landlord’s failure to remedy a defect that significantly impacts habitability.
2) Seek the return of your security deposit, as the termination would not be attributable to any fault of yours.
3) Claim damages, which may include documented moving costs, temporary accommodation expenses, and any other losses directly resulting from the landlord’s breach.
4) Request a rent reduction for the period during which the property was unsuitable for use, if you remained in the premises.

To strengthen your position, we advise maintaining full documentation, including photographs, inspection reports (if available), written notices to the landlord, and any medical or health-related evidence. If the landlord continues to refuse corrective action, a formal legal notice may be appropriate as a next step.

If you would like, we can assist with drafting the formal notice or representing you in further negotiations or legal proceedings.

Please let us know how you wish to proceed.

Kind regards,
Esaias