Mediator gezocht regarding a renovation dispute with a contractor in Rotterdam

Toelichting
We are seeking mediation regarding a renovation dispute with a contractor in Rotterdam.

The contractor began work on our apartment in July 2025, with an agreed timeline of 3 to 4 weeks for full completion. Nearly four months later, the work is still unfinished and a few key elements remain defective or incomplete (plumbing, electrical, flooring, and heating installation).

We have already paid the majority of the invoice (€31k of a total €37k), but due to ongoing delays, damages, and poor workmanship, we are now in a dispute with him over final completion and financial settlement (for damages and months of hotel/airbnb stays while the apartment is not ready).

We would like a quote for assistance in reaching an agreement on either completion of the remaining work or a fair reimbursement.