This place is magic. We accidentally stumbled upon it solely because we were staying at the Porto Venere Grand a short walk away. We visited it it two nights in a row for the views and sunset.
I decided to swim on our second evening - there are tourists and locals alike sunbathing, swimming, and cliff jumping. It’s a bit of a steep walk down, so would be difficult for someone with mobility issues. Also, you have to make sure you’re comfortable exploring and swimming without a lifeguard/safety personnel present. If you’re comfortable, I highly recommend grabbing a picnic and some champagne to relax on the rocks and enjoy some swimming. In the middle of the summer, even at golden hour, it can be quite hot in the sun, so plan appropriately.
There is a rock lower down close to the water that most people were using to get in and out of the water - many were jumping in from higher points as well. I scraped my legs pretty badly trying to get out on the rocks/barnacles - keep an eye out for jellyfish as well - a few of us got stung. Regardless, the scrapes and sting were well worth it as this was a highlight of our trip and one of the most beautiful sunsets I’ve ever seen.