My experience at this hotel started in a strange way. During my check-in the girl who was at the reception desk asked for my ID and a credit card. She did a manual receipt of the credit card with no value, signed and with the security code. I asked the reason for this and I was told, that it was in case of any additional service, but at the end of stay she would returned to me. Basically the hotel had full access to the plafond of my credit card. At the end of the check-in I asked my ID back, and she told me that it would be returned at the end of the stay, which I refused. I had to wait for Kostas to come to get my ID back. On my last night at the hotel, the reception was close, and I was leaving very early, so I call Kostas to give me back my credit card manual receipt, at the beginning he refused. I DEMAND him to put it under the door of my room till I leave the hotel, and he did it. I left the keys on the door as instructed by Kostas, because the reception was close at 5am. This is not a very professional way to deal with customers in my opinion.
I spent six nights at the Hotel Mathios, the room was simple and clean, but the swimming pool makes some noise during the night.
I recommend rent car at the airport (25€). Kostas charges is 35€ for transfer from the airport.
Don’t buy at the hotel any tickets for the boat travel to volcano, etc, because Kostas charges 35€ per person and if you buy them directly is only 19€. The Wi-Fi at the hotel is 3€/day.