I am the kind of guy who doesn't take five-stars reviews at face value. In this case I would recommend, don't take the 1-star reviews at face value, or you may miss a good place.
This place is a small cove, flanked by steep rocks, with clear, green-and-blue water: all in all a great place for swimming. It's also good for snorkeling: the sea bottom is nothing special but you can see fishes.
You can certainly find coves as good as this one, and less crowded, if you have a boat and navigate the coast a little; if you haven't one, this is probably as good as it gets on Zakynthos.
Now, let's come to the minus points:
It's crowded. Yes. As any other beautiful place on a Greek island in full summer. If you know what to expect, no minus point. If you look for quiet, solitary places, it's not for you.
You will probably have to park your car at the road side. Yes, but the road only leads to this beach, so there is no through traffic, no problem.
The road is dangerous. Not really. Narrow, windy and in bad condition yes, like most other roads on the island. Again, it's a Greek island, you know what to expect.
Additional information:
The public is made of young people for a good part. Lively, but not disturbing.
Access to the sea is obviously difficult, it's a rocky cove. Water is deep, and the combination is not ideal for small children. I am still pondering if the taverna owners should build small platforms and stairs to access the water, since the taverna building spoils the natural spot already. I'm not sure - and perhaps doing such things is outright forbidden. However my 10-year old son, a good swimmer, spent the whole day in the water and had to be dragged out with promises of ice-creams. As well, it may not be ideal for older people.
I found the water pleasantly chill, other friends found it outright cold.
If you want to stay comfortable you can rent sunbeds at the taverna, they are nice and under sunshades.
The taverna is well kept and is ok for an ice cream or a slice of cake. However don't waste your time and eat a full meal there, because the level of their cuisine is tourist fast-food.