We stayed at Villa Kouros with our two children (4 months and 3 years old) and really enjoyed it there. Everything is as we expected it from the pictures, very clean an tidy, nicely decorated, the kitchen is well equipped, although we barely used it because of the wonderful tavernas in the area. Maria Ioanna is a very kind and helpful host.
Two things that were a little issue for us was the temperature of the pool, which is is really chilly and we could not use it on the windier and colder days. I guess this would not be a problem if you come during the summer tough (we stayed there end of September). The other thing is that the villa is located directly at the street. There is not too much traffic but it's still constantly a bit noisy and disturbing if you expect it to be total calm.
Alltogheter we still had a wonderful time at Villa Kouros und would definetely come back again if we visit southern Crete again :)