Hi,
My wife, 6 year old daughter and I first stayed at Mastorakis also with Kosmar in 2006. We previously stayed for 4 years at Epimenides just down the road a bit .....until Kosmar dropped it, or rather they dropped Kosmar! If you know the area you will appreciate that the Brit tour operators have gradually been edged out in recent years by the Scandinavians who are prepared to pay 50% more for their holidays.
Anyway last year we returned to Mastorakis Village by booking direct with Manolis Mastorakis and arranged our own flights. It was great. Visit http://mastorakisvillage.blogspot.com/ for details.
I've visited this area for many years and consider it the best in Crete, being in easy reach of the White Mountains, Falasarna and everything to make a great holiday. Agia Marina is a perfect base when you have a young daughter! We now have many friends there.
Hope this helps.
Richard