We stayed at Eleni's for 9 nights. We had a great time. The accommodation lays in Foinikia - you can walk to Oia and it's quiet.
The description about the room is absolutely correct. It's clean. Eleni and Georgia (her housekeeper) are really nice. Georgia sat down with us for more than an hour, explained us everything and gave us precious recommendations about what to do (fair price, good experience and not so touristic).
As all houses in Santorini also these rooms and doors are quite low in height - so be cautious if you're tall.

We absolutely recommend a stay at Eleni's! You will have a very good time.