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

How do you decorate your place, what kind of style, colors, and feelings? That will greatly influence the type of door you might want. Also, think of your budget, and whether you want to install it yourself or hire a professional (you don't need to tell us, just keep that in mind). Then look around Houzz, in the products page, they have lots of interior sliding doors and hinged ones, from elegant frosted glass in a dark wood frame, to rustic reclaimed wood planks. You may not want to purchase that exact model, but it might give you a better idea of what would fulfill your airflow needs without sacrificing style.

Photos and a floor plan showing window/door openings would be helpful.

Thanks for your advice. Please note that One longer side of the "L" portion is used to pass through, but the shorter side of the "L" portion does not open up so if need be i can put something. there is a french window which is fixed and cannot be opened up on the shorter side. that side is only useful to get some light in the house. My living room is in white and grey combination. Do u want me to have a rug in the same combination or anything else would be fine. Would appreciate if you can suggest a kind of vase that would go with it. My theme is modern style in the house. I was initially thinking something like the attached picture. pls. confirm ur view on it.