Is that unit built-in? Do you like it? I would most likely remove it and replace it with free-standing furniture. If you want to use it you could paint it or stain it. From the picture it looks like it is not a quality finish. So, you will have to decide what your preference is.

You could place a piece of art or mirror if you are keeping all the cabinets?
Make it a focal point and then add decor on shelves beside it.

if you are not using as a Tv room would you set it up for eating or sitting?

What happens with this unit is totally dependent on what you plan to do with this space.

Does the door bang into it? If you get a door stop or move it down some.

Need to know if this is an extra room, or a living room?

"totally lost on how to decorate this room" . could you tell us what room this is and how you want to use it?

Will you be using this unit as a desk or media area? If not, it just seems like it's too big for this room. Removing it (how complicated can it be?) would open up other options for you in this room. It's not a particularly nice looking unit. At the very least, paint it.

do you need a spare bedroom? playroom? library? music room? craft room? Help us out here.

A tufted cigar sofa would look nice!!

Ok, then you will use the unit? For books?

Provide a photo please of the opposing wall to unit.

It would make a great office/desk/workroom with a view of deck where you could have potted plants.

I'd begin with a carpet. How big is this space?

You need to help us here.

Turn it into a bookcase/desk: