This is a typical urban space.
I gave four stars for complete atmosphere, because the beach is located near taverns, so imagine the feeling- you are eating wonderful food next to the water, with millions of fish swimming, many colourful boats, smell of sea and breeze.
And this is my recommendation: go to Pollonia and enjoy your lunch next to the beach. And that's it.
I don't see why would anyone go from other part of Milos for swimming on this beach. I'm not sure it's clean, with all these boats and next to the "urban" area, id we can call Milos villages an urban area.
Since there are many taverns here, there are many cats. Now, don't get me wrong, because I love cats more than life and want them everywhere, but I witnessed two cats "doing their business" on the very same beach. :) So, you get the point.