Ask whether the invoice separates labour (arbejdsløn). The service deduction follows that line, not the cleaning products. For a move-out clean, ask if they offer a handover guarantee (afleveringsgaranti).
In København most jobs are in apartment buildings: Vesterbro, Nørrebro, Østerbro, Amager and Frederiksberg. Access, parking, and whether scaffolding can stand in the courtyard move the price more than the postcode. The same 3 businesses as the Danish page: Rengøring Til Dig ApS, Vinduespudser.dk ApS, Servicefirmaet EksaktRengøring ApS.