For many years it seemed as if the other half of our long room was wasted space.
We had the living area, TV, sofas chairs at the one end where the large front window to the street was located.
At one point we had a dining table in the second half, by another large window, and that worked for a while, extra work for me ferrying plates and food back and forth from the kitchen, as I had recently sacked the parlour maid :)
We had wondered if originally it was always meant to be a dining area.
In time an antique sideboard with large wall mirror replaced the dining room set.
We had a long bookcase attached to the wall which was useful for the DC's books as well as our own.
The room still looked quite empty even with plants, mirrors, and two large windows.
Finally, my DH separated the room in half by putting up a wall with a near ceiling to floor double door that could be opened when needed between the two rooms, which has been very nice at times to give a larger feel.
He installed near ceiling to floor wall cabinets with very large drawers, on the other side of the living area, along the entire length of the new dividing wall, to accommodate a lot of stuff!
Now the TV / sitting area is much cosier, not to mention warmer, and the second portion of the room which was supposed to be a sitting area for one of the DS's, became instead a room for his piano, three guitars, and a table with 2 sewing machines, lots of light with two large windows,and overall, we are much happier with it being two rooms.