I couldn't tick one or the other of the boxes – I think the choice has to be made contingent on so many variables. In fact we have painted timber, double-glazed bifolds (with a fabulous retractable pleated fly-screen) at the end of the dining room leading out onto a terrace and a painted timber, double-glazed slider (with a timber-framed sliding fly-screen) on the other side of the kitchen (but on the same axis) opening onto a raised timber deck. Each works really well in terms of function and aesthetics but they would not be interchangeable as the different locations determined which was more suitable – but they have been made by the same highly skilled window craftsman and have given us nothing but pleasure. And on a hot, steamy evening with both open we have the most wonderful cross ventilation.

He's a professional who didn't do his job right. I hope you told him that his template was wrong. I'm surprised he didn't notice himself!

we need some photos or a plan showing the dimensions of the spaces and the width and height of each window and what are the walls made out of but do you want or need to be able to go through the doors to an outside patio or is it just that you want more ventilation?

As the fireplace has the bricks visible , I'm guessing it isn't actually used ? I'd be tempted to have the TV directly above the fireplace -- almost where the mirror is , but probably the top of the TV at the level of that frieze or whatever it is called , and angled downwards . The mirror I'd have where it is height-wise , but to the right on that same wall . And I'd leave that drinks trolley where it is , with nothing above it , or maybe a period wooden framed picture or photo above the drinks trolley .