It is a nice room, and you have nice furniture. I agree with others that you could warm it up and make it cosier with lights on side tables and walls (you can get rechargeable wall lights and plug in ones if chasing out plaster isn't what you want to be doing right now - Lampsy has a wide range, and good price points). Add colour and pattern with cushions and blankets on the furniture. (Anyone who might want to give you something like this for Christmas?) THe TV on the table is the right height for viewing from the sofas, and I wouldn't hang it above the fireplace. Hang pictures, etc, lower down. (I think galleries usually do mid point about 150 cm above ground, but you can google this and check!)
The window is pretty, but needs warming up. Can you add curtains? - like, generous ones, with the rail close to the ceiling, and curtains down to the floor. Interior designers sometimes suggest using inexpensive, quite light weight, ready made ones (IKEA, Dunelm, H&M) and doubling up (two pairs either side) so you get lots of volume.
I"d slide the rug underneath the sofa, so they're more of a piece and you don't have a 'rug island'. The fireplace is really nice, and if you use it as a decorative shelf (lots of ideas on Instagram/Pinterest) with layers of pictures, postcards, vases, trinkets, candlesticks, whatever, you add interest to the wall for very little money.
When Christmas is over, and you move the tree, don't put the side tables back in the middle of the bay - they're nicer distributed around the room as side tables next to seating where they're more useful.