My boyfriend and me stayed in Elena´s place for two nights and we had a wonderful time! We were accommodated in one of the studios, had a little kitchen and a terrace with the magnificent view over the Bay of Plakias.
Unfortunately we haven´t met Elena in person but her lovely parents were around :-)
We can absolutely recommend this apartment (especially in low season, when you do not have to share the terrace and the garden). Mithios is a nice little mountain village and in my opinion it´s better to stay here than in Plakias itself, when you are looking for calm place for relaxation!