The room in question is only 3m x 4m, and I have to make it look as
spacious as possible....

sorry about the previous post.

Without challenging, why do you want it to look more spacious? It could be
cosy, snug, normal ...

But if you insist I'd suggest having no patterns at all in the room and as
few colours as possible, preferably light. You don't say what the purpose of
the room is but if you keep all furniture round the walls there will be
floor space in the centre. If you have children they'll fill that
immediately :-(.

Our sitting room is that size and it's the one almost everyone says they
like as soon as they go into it, spontaneously.

Size doesn't always matter!

Mary

Thanks

Frank