Camped here with 3 teenagers and a 3 year old just before it was shut down in March 2020 for COVID.  We planned to go to Haws Creek but it was closed due to flooding, so we got in late in the evening.  It was during Spring Break week but there were still spots.  We didn't pick the best one (inside the loop) because it was dark when we got there, but even so it was still flat and enough space from neighbors.  The spots on the outside of the loop have more privacy so I'd recommend one of those.

We spent two nights and did make the hike to Twin Falls.  Had to carry the 3 year old some just to keep a decent pace, but it was worth it.  You'll have to ford the creek at least once and the trail isn't easy, but it's well marked enough that you can't miss it.  Two of the teenagers wanted to quit after about 2 miles, which was still a beautiful hike, but the rest prevailed on them for the last half mile and they were glad they did.

There are a number of other waterfalls and trails nearby, and in summer the creek would be a lot of fun.  The tradeoff for going in March and the falls running well is cold water and cooler weather though.

As others mentioned, no phone service (a blessing) and no showers, but fairly clean toilets.  

The only complaint was our firepit had recently had all the ash removed.  Starting a fire 2 feet deep in a barrel with no air flow proved a challenge, though we eventually got it going.  I recommend bringing some of your own starter wood because the area was picked fairly clean of all but small sticks.