Black wrought iron from the top of the glass "fence" to the ceiling of the balcony would be pretty. The contractor will know how far apart to install the WI for safety. I wouldn't have any fancy WI design, just plain. The WI could also be installed horizontally. Extending the glass would be pretty, too! If the area was fully enclosed you could keep the french doors open more often and incorporate this balcony area into your living space year round. Also it would keep out dust and wind and rain & would be easier to keep clean, maybe there could be a vent for fresh air when the weather was nice. Could you talk to someone who has enclosed their balcony for more information? Depending on the sun exposure, you might need screening, too. The furniture & colors should harmonize with your living room. Ask your family what they might use the balcony for. If to sit and enjoy the view and plants, you will want one type of furnishing and if to eat on the balcony you'll need a table and chairs, too. This is a cute balcony arrangement, but I do not know how comfortable the little WI chairs would be: http://lh4.ggpht.com/_t8-Y4w1UKrc/Sa9w-hXyEeI/AAAAAAAAVrc/hb9dAYdw59c/s1600-h/image%5B45%5D.png

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.

I am an amateur lover of home decorating. I too have a very awkward long narrow living room that is 350cm by 620cm. Additionally it has diagonal traffic flow from the front entry to the rest of the flat. The owners have built a cabinet at one end for the TV, etc. I think I would make a cosy seating area at one end of your long living room. Place a grey or brown sofa at one end but not against the wall. I like the idea of a narrow console table behind the sofa with a table lamp, a plant or a large statue. This brings the end wall closer in. A peachy or raspberry carpet in front of the sofa will pick up the wall colour and anchor this seating area. (grey and some browns also coordinate with raspberry/peach). A couple of raspberry sofa cushions can help include the wall colour into your overall scheme. Single chairs opposite the sofa allows visual and actual flow down the narrow room and completes this seating area. At the other end of the long narrow living room I would place a reading chair, a floor lamp and a small round coffee table. If there is room you could have a tall bookshelf with you favourite books. What do you have on the long side walls? I have windows and doorways on both long sides. I decided to use pull up shades on the windows instead of curtains which I thought would make my narrow living room look more narrow. The wall colour is white but I think I will tone it down to a soft grey. I plan to paint the end walls a darker grey.

Depends on what effect overall you want -- hot tropical feel (oranges and reds) or a bit more toned down? You can take inspiration from pictures of gardens with lime green heuchera or sweet potato -- often paired with chocolatey purple, silvery greens and blues.