Romano Garden House is just as lovely - more lovely, in fact - in real life as it is in the pictures. The garden is incredible; the views of the sea from the top terraces are stunning; and the peace and quiet will wash away any stress you might be carrying with you. The beach at Agios Romanos is perfect - sandy, heavily shaded by trees; with gentle waves, and quiet, with a lovely beach bar for sandwiches and snacks but not much else.
The only thing I'd note is that if you're travelling with very small kids, there are lots of steps everywhere, inside and out, so you'll have to watch them. On the other hand, they'll love the kitties, the fruits and vegetables, and the beach, so it's swings and roundabouts!