We had a fantastic stay at Kostantinos's place. The flat is as shown on the pictures, part of a bigger house in a residential area close to the beach and 15/20 min drive to Rhodes old town. Communication was great. Kostantinos helped me to find a rental at 4am in the morning when we were landing. Thanks again!
His family was great too, always happy to help, brought us clean towels and offered some local pastries and oil.
Definitely I would recommend to stay there.
Just beware that between 19-21 there are some issues with water, but it's an island problem. We had the same problem at the beach were water started running low at that time too.