Perhaps a large round table might mean a rug is not at all necessary. It could be a metal tray table, or carved wood like Rebecca Mitchell Interiors illustrates. Ideas also to consider, using multiple tables can be found at http://www.houzz.com/multiple-coffee-tables. I also agree with comments above that some color is needed on the walls. You could then hang round mirrors, or an unusual curved shape like RMI shows above.

Susan, I find that people often make their coffee tables too low and too small. Measure the height of your sofa cushion and pick a coffee table that is a similar height. Also, in the layout you posted above the room would look better with a larger coffee table. Even as long as your sofa, or close to it. Let me know if you need one custom built, it easier to get the right thing for your room than you may think. Here is my etsy store if you end up needing one custom built. www.etsy.com/shop/MetalTreeFurniture

Not completely......the side sofa can extend till the centre of two doors and then the lower table comes, still allowing a generous space of one side sliding door opening to outwards....the doors can slide anyways which is majorly for viewing purpose and do you really need that large excess to opening...i was just curious....the glass door looks like 5 feet so you will be left with 3 feet of opening that is equal to any generous door size.....is there any major use of balcony except for vegetation and small gatherings which could still happen with the 3 feet opening........

two basic issues your room floor is dull is that floor to floor carpet if yes then add a a smaller area rug under your table to get splash of colour, alternatively if you dont want to do that then add some colorful wallpaper behind the sofa. Where you have the table lamp add something taller like a modern floor lamp or a tall spread out palm plant. Take the table lamp and add to a side table if you have one. The second biggest issue is that you have a lovely modern sectional sofa and then you have paired it with a very traditional and very high coffee table that looks like it has marble inlay work done (cant make out clearly). This is not a good pairing. The coffee table is the right size but get something modern and a lot lower, a general guide to this would be one inch to 2 inches lower than the seating height of the sofa. As someone else mentioned an Ottoman that can serve as a coffee table in an alternate colour will also work. Paintings and wall art is something you can experiment with but unless you do something about the coffee table the room will continue to look odd in my opinion. Also some more shots of the room will help us get perspective.