We've not camped in Potsdam but very close by.
What a fabulous place with all its Palaces.
We moved there from a campsite to the south east of Berlin (near a big lake), which we found was easier to visit the Capital from as there were many Park and Ride trains nearby. The campsite management were particularly helpful by providing us with a comprehensive map and excellent instructions on getting to the railway station car park.
Are you doing other places? If so I the east we strongly recommend Dresden and Colditz which is close by. Also Lutherstadt Wittenberg.
Any where else please ask and we'll see what we can do.
Randa

Geoff, since retiring I have used mainly ACSI sites. This year we did 4 weeks in Holland over June/July. I did not plan to book but was advised this was close to high season and as we wanted to stay for periods of a week or so it was best to do so. If we had only wanted to stay a few days on each site I would not have bothered. It would also have saved me a booking fee, that you still need to pay even if using ACSI.
Some sites you can book through the ACSI site, but unfortunately not for our chosen sites. I contacted sites directly and booked online with a photo proof of ACSI card which resulted in the reduced rates being charged, any corrections usually being applied when I paid the balance. One problem doing this is although you can pay a deposit on the credit card the balance if required before you arrive could be by IBAN bank transfer, which is a pain.
If camping out of season I would bookmark a few sites in each of the areas you plan to visit. If you roll up and they have no places or do not look brilliant just drive to the next.

Colin

Hi Geoff. Apart from the first site abroad, we don't bother to book others and we've only once been turned away because they were full. That's in 13 years.

Normally the ACSI "Acceptance Period" doesn't apply from early July through August.

Almost all countries consider anytime other than the above dates as "Low Season." The two exceptions are Germany and Austria and each "State" (Department) in those countries has different Holy Days. We had a laugh with a young German Family when we were camping near Nuremburg and only managed to squeeze into a campsite overflow field in June. When we asked them which Saint they were celebrating, thier answer was "we don't know and who cares, we call them Happy Cadaver days"

Take a look a this example of a German ACSI campsite https://www.campingcard.co.uk/germany/rh...agmuhle-102119/

If you pan down the page to the "Acceptance Period" the dates in white squares are not periods where you can benefit from ACSI. This will apply to any ACSI site you will look up throughtout Europe. Note also the Average Rating number in the orange square beside the photograph. We try not to go to a campsite that has less than a 7.5 rating as there is normally plenty of choice.

Also please note that if you are planning an ACSI based trip for next year, the campsites may still be there but the numbers will be different. The campsite I've used as an example is ACSI 620 this year (see number in blue oval shape in orange band.)

Randa