Hi Ziggy,
I don't know Atlantis but I'm fairly sure we stayed at Zorba in mid-June 1997.
At the hub of the village is a big art/jewellery/craft shop with a big frontage on a corner.
I think that on top are the Zorba studios.
If I am wrong, no doubt one of the other regulars on here will put me right.
In '97 we had the one right on the front corner with a huge balcony. It was a very nice studio and having the big balcony overlooking the centre of the village was superb for people watching.
However, there was a big disadvantage.
The studios had a flat concrete roof which soaked up the sun's heat all day and, just like a storage heater, gave it back at night, making the studio very hot indeed.
It may not be the same today.
Perhaps they have added another storey above or put in air conditioning.
I would certainly check before going there again.
Even with air conditioning it would not be ideal because you'd need it on all night and have to suffer the noise.
As to temperatures in Plakias, by mid/end May the weather is likely to be settling down to fine and warm (28-32 degrees) and, near the shore on calm days, the sea is likely to be about 23 degrees.
However, it is still possible you could get some rain or high winds.
There are many posts on this board with weather information and I suggest you browse around but you could start
here.