Can you paint any of the furniture? I'm assuming not.
I agree with pp, spin the sofa 90 degrees and put its longest edge against the wall with the door on. Leave coffee table facing same direction but centralise its. Get a good rug with colour/pattern and get cushions and throws to match it. Pinks creams and greys are very in at the moment, with textures like big cable knit blankets or those fake sheep skin rugs. Drape then across the sofa. Get a white tray (wooden - home bargains sell them for like £2) and put that in the coffee table with a vase with flowers and a nice candle.
Move the ugly ass leather old person chair to (the bin preferably, but if not possible) to where the end of the sofa was previously. See if you can get a cover for it or at least a throw or something and a cushion. See if you can pick up a cheap foot stool to place in front of it. Move the random small side table that's currently in the corner where the sofa is going next to it and put some decor on it like a nice cup coaster/candle/photo frame.
Leave the dining table where it is I guess but maybe get a runner or at least a case/fruit bowl for the centre of it to make a feature.
Get rid of the picture above the fire place and put some frames/candles on there. But the fire place isn't awful! Maybe a mirror if your budget allows?
Tv I presume will go on the second random table in the corner. Maybe get wicker baskets for underneath with more blankets in to cosy the room up?
Tall plants by the fire place or in corners will look nice. It's very in for them to be in those woven baskets from Ikea etc at the moment. And if you can, change the curtains to go with your colour scheme.
X