How about painting the stone a light, light gray? If you want to take the time and step it up a notch, you could paint the grout lines a tad darker gray...to look like this,..

Gray painted brick...

Before you paint I would do as Paley Design says and if you still don't like then paint. I think even painting it all white would still have texture. Think it does need a little dressing up.

Yes, a good cleaning with TSP may help you like the FP.

What type of stone is it- looks like sandstone maybe? I don't know if you can successfully paint sandstone as it is so porous. I would leave it as is...it's really beautiful.

Paint for now, here's my vision for later...
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I agree with Paley Design Group, am very much in favor of keeping the stone and enhancing it with a live edge or rough hewn mantel to go over the fireplace up to the end of the stone and extending the same amount to the left. You could cover up the red brick at the bottom with a plank of the same wood - all the way along. Do you have an architectural salvage yard nearby? Can't wait to see what it looks like! Don' forget to post some pics please.

We have a rental beach condo which needs updating. Is it a bad idea to remove the tub in the master bath and just have a cool walk in shower? There would still be a tub in the other bathroom

I can't add a hearth . We took one out so there is more room to walk to the kitchen without bumping Into it. I will also add a beam and put something over it like a mirror .
I'll attach a photo. I like the idea to leave it as is, not to paint but I don't know what to use to clean it up with? My Husband put something shinny on it , but I don't like it . On the other side there is a fireplace also which I painted , if I paint this one It will be too much . I'll attach a photo of my other fireplace . Please tell me what I can clean it up with?
Thanks

Not sure what kind of a stone it is

If the picture on the right is what your question is referring to, you're going to need some type of paint thinner. I can't tell, from the photo, what's been applied, but, from my own experience; you'll need a heavy duty wire brush and paint thinner to remove the finish...

Looks like you renoed the kitchen. Too bad you couldn't have relocated the fridge.
I would get a large abstract painting/picture and hang it on the fireplace wall next to the fridge to break up all the stone. Lovely stone btw so don't think I would paint it either.
What are you planning on doing on the bottom of the fireplace.