A larger square rug, with warmer colors, would suit the home's bones much better than the contemporary round one. The overstuffed sofa juxtaposed to the sleeker vintage looking French inspired sofa and chair is a miss. One or the other has to go away. I'd vote for the blobbier furniture to leave since you have multiple more gracile looking pieces that would need to be changed if you went the other direction. Those stained glass windows provide a bit of jarring color because the rest of the room lacks color so much. Ramp up the color a bit with accessories so they don't look so lonely. Or cover them over with frosted glass indoor storm windows to conceal the shocking brightness for this iteration of the home's décor.