If you want useful -- I highly recommend a small table with two chairs in the one end. Also, bookcases with glass fronts, or, like I did -- one bookcase and one secretary that closes up to hide the paper and computer monitor. I use my 36" square table for so many purposes -- morning coffee, afternoon tea with a friend, making jewelry, drawing, computer, solving jigsaws. Mine has two leaves that pull out, so I can also bring chairs in from the dining room if I want to have four people in the space. My space isn't crowded. There's at least 4' of space between my table and the rug. You're fortunate to have fewer doors and windows, and a 15' width. My 1939 living room is 12' x 21', so it's divided into three spaces instead of two. My secretary and bookcase had to be on the other end of the room.

I'm in agreement about the "dining room" chairs. Straight chairs don't invite people into a cozy conversational grouping. The fireplace looks portable to me. Perhaps finding a better location for it will breathe new life into the entire room. A new rug only needs to be 2-3' wider than your sofa. If you keep the leggy chairs, they need to sit entirely on it. Use painter's tape on the floor to figure out the best standard rug size to work with your things. Remove all the accessories and art for a total refresh and update based around your sofa and coffee table. The tufted sofa keeps us in the more formal arena, but you can do transitional, rather than traditional. Search the box above under Photos for transitional living room, and start an ideabook of ones you'd love to replicate here.

There is 2 of us and a baby due soon. We do have family visiting often I like the idea of a three seater and 2 arm chairs

Honestly, it looks fine. Although it’s smaller than the one across from it, you’ve balanced it out really well with the little trunk chest and lamps. If you’re wanting to change it because you’re bored or wanting something else, that’s fine too, but what you’ve got going on works well.