I have tried to enlarge your plans but they become to blurry to read.....Is there anyway that you can post a larger jpeg?

The best way to make a small space look larger is to avoid the tendency to add in too much furniture, or make it too large-scale. You need pieces that offer you enough seating, but with smaller profiles in both your living and dining space. Look for multi-functional pieces with storage, keep the wall color the same in areas that flow together, and use the walls for vertical storage and display instead of relying only on freestanding pieces. Look for furniture retailers that advertise "apartment size furniture," and see Houzz Photos under "small space living" and "vertical storage? for ideas. You can use art, an area rug or similar to decide your color scheme. Your apartment really isn't that small, fortunately, by big-city standards.

I think I am certainly quite late to reply on this post but nevertheless will put my suggestions here. Go for 2 loveseats in a light/neutral colour against the 7 ft and 15 ft wall. Opposite the 15 ft wall you could put a nice upholstered bench in contrast/printed fabric. Also for a warm glow put a nice standing lamp in the corner between both sofas. You can place a nice mirror on the TV wall and put a nice shelf beneath it and place a lamp there with few knick knacks if the door opens outside in the balcony or is sliding. Also, keep two upholstered ottomans below the mirror which can be pulled for extra seating when required. Place a low height coffee table small one like a 2x2 ft.

it is a long narrow living room