Hi Karen. Apart from Kaloudis, Marvel, Bardis Hotel, Anna's and Elena Stella, I think you mention all of the pools. None are Olympic sized, all geared for leisure and holidaymakers. Sandy gets her lengths in at Rainbow every morning (fair makes my eyes water just thinking about it! I don't "swim" except in Mythos, I just paddle and float in the sea!)
I guess Rainbow is probably your answer. You might have to do twice as many "lengths" to cover the distance.....
loveandhugs. See you in July!
Phil