csimeon,
The biggest issue with your scene is their are almost no shadow defintion in most of the objects they are like floating in your scene without good shadows. Need good shadows for a realistic render.
I would recommend do Cycles render and look at the scene shadow definition. Add contact shadows and shadows with ambient occlusion and proper light settings. For shadows under sofas and other large items and nested irradiance probes see examples in Nested IRVs or Classroom tutorial.