We stayed here in August, and whilst I cannot fault the friendliness of the wardens and the layout of the site, the main grip was the times chosen to clean the toilet block.  10:30 - 12:00 seemed to be when most people actually wanted to use the facilities and this was when they chose to clean them !  Perhaps going to a time later in the day when most folks are out exploring would be more suitable?  Worth noting as well that there is no wi-fi on site & mobile signal is "variable" (this is great if you really want to live off-grid for a bit, but after about a week we started to get withdrawal symptoms).  The road in is quite narrow & don't expect all drivers to be considerate to the fact that you are towing a caravan !  Local Nisa supermarket in St. Davids provided a good (and mostly cheap) place to shop.