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This paper reports on a partially simultaneous observation of the brightSeyfert 1 Galaxy Mrk590, performed by XMM-Newton and Chandra. The long exposure(~100 ks) allows to investigate with great detail the Fe K complex at 6-7 keVand the presence of soft X-ray spectral features. We have analysed XMM-Newtondata from the European Photon Imaging Camera (EPIC) in the 0.5-12 keV band andfrom the Reflection Grating Spectrometer (RGS) in the 0.35-2.5 keV band, anddata from the High Energy Transmission Gratings (HETGs) onboard Chandra. UV andoptical data from the Optical Monitor (OM) onboard XMM-Newton are also includedin the analysis. The broad band spectrum is well described by an unabsorbedpower law and three unresolved Fe~K lines in the 6-7 keV range. The presence ofa Compton reflection component and a narrow Fe K line at 6.4 keV is consistentwith an origin via torus reflection. The ionised Fe lines at ~6.7 and 7 keV areinstead most likely originated by scattering on a warm and ionised gas. Thesoft X-ray spectrum appears to be almost featureless due to the very brightcontinuum emission, except for one emission line identified as OVIII Ly alphadetected at ~19 Angstrom by both RGS and Chandra-MEG. The emerging pictureconsists of an active nucleus seen directly on a "clean" line of sight withoutintervening material, surrounded by photoionised circumnuclear gas at a highionisation level.  We also study three serendipitous sources in the field of view of Chandra andXMM-Newton. One of these sources may be identified with an ULX of L_{0.3-10keV}~10^{40} ergs/s.Comment: 10 pages, 13 figures, accepted for publication on A&A including  referee's comment

An X-ray look at the Seyfert 1 Galaxy Mrk 590:XMM-Newtonand Chandrareveal complexity in circumnuclear gas