Actually, there is a designer who has designed a sofa/table piece. You can see it here - http://kononenkoid.com/julia-kononenko-projects/convertible-sofa. That may help you visualize your planned project.

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.

HI -- The sofa and the chairs and the rug are fine together .... what I don't like is the storage ottoman . It would look better if you had a coffee table with some glass on the top and a wood or metal base . Then add some drapes in a natural linen or some with a natural background with thin black stripes or add a small black border or edging . And a lamp or two with oil rubbed iron bases and linen shades . Then some better cushions . Put matching lumbar pillows like the one on the sofa for the chairs then the red square ones on the sofa and add in a fur one or two in black .

Hello dear, You can contact Oriental Creativity. Here you can get a good dining table set that can completely fit in your dining area. I bought a 6 seater dining table set from this shop at a very good range.