I have used ATE Insurance for vehicles but so far not for buildings. The quotes I have had from them for buildings have been very competitive. In 2015 they quoted €309 or €279 if I paid by Direct Debit to my credit card. That was for €145,000 rebuild cost and €27,000 contents insurance and includes earthquake cover. The earthquake cover is subject to an excess of 2 % of insured value, i.e. €2,900. The policy is underwritten by Munich Re, possibly the world's biggest insurance underwriter. I don't have a contact down your end of the island but you could try stephanoskatsifarakis at yahoo dot gr who is one of their agents in Chania. He might be able to give you a quote himself or put you in touch with an ATE office nearer to you.
I currently use Intasure
in the UK who are underwritten by Lloyds of London. They insure both holiday homes and ex-pats homes. I pay a bit more than the ATE quote but they have massive rebuild cover so I don't need to think about whether I have the valuation correct. I think they have a £5,000 excess for earthquakes.
I think all companies tend to have a big excess for earthquakes because they don't want claims for repairing cracks or tiles fallen off roofs. It is really there to cover the possibility that your property is totally destroyed. In that event I think we would all be quite happy to pay £5,000 as long as the house got rebuilt.
PS You might consider starting new threads when asking completely new questions, with the title indicating what the thread is about. This one is now very long and covers a very diverse array of topics. Threads will always tend to drift but the nearer they stay on topic the better. You don't get charged any extra.