The communication with Stefanakis when trying to check in was a joke since there wasn't any. We informed them about our arrival time and asked them about the check-in procedure. No reply. When we got there in the evening there was nobody around. So, after we tried to call them on the phone with nobody answering we decided to check in into the only house where there was an outdoor light turned on and a key was hanging at the door. As we complained about the missing communication afterwards and asked if we got into the right house there was still no reply. Then, on the other day, in the afternoon a guy from the operator of the estate (Stefanakis is not the owner) showed up and accused us of illegally using one of their houses without having any booking at all. After proving to him that we indeed had an already paid for reservation and expressing our displeasure about the whole check-in process he deeply apologized and told us that Stefanakis must have messed something up. However, we never got any response by Stefanakis let alone an excuse for the trouble they caused.
On the other hand, the villa we stayed in and the whole estate are very beautiful and we enjoyed our stay, nevertheless.