Ok, it start to look better now. You can crank down Photon map accuracy to "0" and it will render a lot faster with very little (or no at all?) quality loss. In this scene I think you could set object accuracy to "1". No matter how high quality settings or how expensive render software you use, you will always end up with some noise in the end. A cheap but effective trick is to add a texture (wallpaper) to the wall, then you won´t notice the noise. If the noise still bugs you there´s always photoshop.  Oh and one more thing, you got a "floater" on the table (magazine hovering above the table).