Ours is much the same size, unheated, outdoor light and sockets in one place.
It permanently houses dining table, chairs and tumble dryer. Oh, and I left up the string of soft white Christmas lights, they look nice.
It temporarily houses toolboxes, recycling boxes and bags.
Winter: we have a heater and use it occasionally for eating or playing board games. I also use it to de-clutter the house, stuff gets taken in there and comes out to be used or gets recycled, taken to charity or thrown. So it is currently a messy work in progress.
Summer: we eat in there. I use it as a craft and sewing space and we both use it as a home office. De cluttering and recycling on a smaller scale takes place all year round.
I would iron in there, but there is no telly. But I do sort clothes in there, so it also often has piles of clothes to be ironed, recycled, taken to charity or thrown.
We did think it would be a bit of a useless space but it has turned out to be an active junk room that actually gets sorted and emptied regularly as well as a dining room and craft/DIY space (I forgot, DH uses it for DIY prep all year round - it has slate flooring and is easy to clean).