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Based on observations with the X-ray observatories Chandra and XMM-Newton wepresent results from a detailed spectro-imaging and timing analysis of thecentral compact X-ray source RX J0822-4300 in the supernova remnant Puppis-A.The superior angular resolution of Chandra allows for the first time topinpoint the point source nature of this object down to $0.59\pm0.01$ arcsec(FWHM) and to determine its position:{RA=$08^{\rm h}21^{\rm m}57.40^{\rm s}$,Dec=$-43^{\circ}00^{'}16.69^{''}$ (J2000)} with sub-arcsecond accuracy.Spectral fits based on Chandra and XMM-Newton data provide a tight constrainton the emission properties of RX J0822-4300. Most of its X-ray emission seemsto be of thermal origin. A model spectrum consisting of two blackbodycomponents with $T_{1}\simeq 2.6\times10^{6}$ K, $T_{2}\simeq 5.0\times10^{6}$K and $R_{1}\simeq 3.3$ km, $R_2 \simeq 0.75$ km for the blackbody temperaturesand the size of the projected emitting regions, respectively, provides the bestmodel description of its spectrum. A search for X-ray pulsations from RXJ0822-4300, revealed an interesting periodicity candidate which, if confirmed,does not support a scenario of steady spin-down.Comment: Accepted by A&A, 20 pages, 10 figures, 3 table

X-ray observations of RX J0822-4300 and Puppis-A