Camping Spartacus is a comfortable camping site in Pompeii, located just across the road from the entrance to the excavations. The location is excellent - easily accessible from the Autostrada, as close as you can get to the excavations and there's a good supermarket about a five minutes walk up the road.
The campground in general is reasonably well maintained, and the sleeping facilities are good - we stayed in a chalet and our daughter had a Chiocciola (caravan) and both of them were in good condition. The showers in the rooms were fine - plenty of hot water, although there weren't enough towels to begin with (more were supplied upon request). There is a railway line that runs behind the campground which is rather noisy during the day - but the trains don't seem to run at night, so this was not a problem.
There is a laundry room with washer and dryer - very useful! The public showers for the tent dwellers, although we didn't use them, seemed to be very clean and tidy.
The one drawback was that despite being specifically mentioned on their website - none of the other facilities were available. The cooking facilities were "out of order", the internet was "broken", the grocery shop and pizzeria were "closed"...etc. Maybe it's because we were there in October - but there was an air of "end of the season" about the place (although the campground was pretty full most of the time).
In short - nice campground, great location, lot's of potential for being perfect if they would put a little more effort into the facilities.