In the US Red River makes a very nice heavy weight double sided matte paper. The one I've used for very attractive invitations is aurora art natural. For two sided printing with excellent quality photo reproduction this is quite a nice paper. It appears that you are in Europe so I'd check out the various double sided coated papers there if you want to print both sides. I'd say, again, that the gsm weight designation doesn't tell you the stiffness, "snap" quality, or the surface texture (sometimes referred to as the "hand")