The Kalyves agents I'd suggest contacting are:
Crete Island Estates: info at crete-island. net +30 28250 83155 www.crete-island.net/
(Hilary or Claudia)
Alpha Omega: info at aocrete. com +30 28250 31860 www.aocrete.com/
(George or Helen)
Minoan Properties: info at minoan-properties. com +30 28250 32272 +30 6972 724167 Skype: Minoan properties www.minoan-properties.com/
(Maria or Georgios)
Minoan is probably the best for rentals but all three are reputable and will have a reasonable choice of properties in the area.