Is this wall above ground or in a basement? Water penetration isn't good so you need to find an inspector (home insp or mold insp) who can examine your roof, gutters, siding and who has an "thermal imaging camera". Lesley is on the mark about mold which needs moisture to grow. So, have a pro get up on your roof especially in the area near the water stains. Another tip, get it done before winter and bank on tearing out that wall to treat the wood studs with bleach to kill anything.

Given your space constraints, I think it would be best to hang the TV on the wall that is common to the study/living room (just to the right of the door entry). You could get two or three small upholstered chairs for the living area (gives you flexibility in moving them around.) I would have a table surface hung so it can swing out and be used on the wall between the door and the opening to the kitchen. If hung with a hinge attachment so it can be flat on the wall when not in use, you still have space to move around. Backless bar stools could be lined up on that wall when the table is stored flat to the wall, and still be used for more guest seating.

I'm a Certified installer for Trex decking. Trex Transcend is encapsulated board, with a finish that resists staining, scratches, mold and has a high definition wood grain surface. I don't know what you did to it or whoever worked on your house did something to it, but Transcend decking does not need staining or painting and the protective shell protects decking against fading. Trex Transcend and a few other Trex decking products like Trex Enhance, and Trex Select, they cannot be painted or stained. The only thing can be painted is Trex Transcend White Railings and you should only use light color paint. If you use dark colors, it will absorb heat and it will damage the surface and you can kiss your railings good bye. Also high quality fast drying primer should be used and you have to use Oil or Water based exterior paint and most importantly surface prep is the the key. When it comes to painting specialty surfaces like Trex Railings, hire a Pro to do the work. With that said, if you installed Trex yourself, you have to go to the store and have a Trex representative come out and check your deck. They will determine if loss of color fading was due because of negligence or not. If its a material defect, they will cover the material cost. If you had a Certified contractor do the work, they will cover material and labor. Call your contractor and he will get a Trex Rep to come out within a few days. Good luck

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.