Apparatus for refilling the filter-holders of a machine for the preparation of espresso coffee with selected doses of ground coffee. The machine has a plurality of dispensing units for the preparation of coffee beverages, each dispensing unit having a detachable filter-holder and a plurality of keys for selecting the beverage to be dispensed and a coffee bean grinder and metering device provided with a hopper for supplying beans of a desired grain size. The grinder and metering device has a hopper for supplying ground coffee and supporting means for the filter-holder. An identification unit generates information for recognizing the filter-holder of a selected dispensing unit and information related to the dose with which the filter-holder is to be refilled. A detection unit detects the information generated by the identification unit. A wireless device transmits the information generated by the identification unit to the detection unit.