You can spend the night in the parking lot of the abbey. The toilets, € 0.50 are only open during the opening hours of the abbey.

We were there at the turn of the year 2022/23. Ideal with a dog because it is very quiet. Great view, beautiful monastery you can visit. Clean public toilets. Nice parking attendants, 8 € fee totally fine. Access with Womo 7.5m / 4.4to without problems

nice location, but it's nothing you more than a quiet parking lot.