Positives :-
1) The cave house is clean, nice and has a nice & beautiful terrace and outside space.
2) Eleni and Anthi are very quick to respond and very good with communication.
3) They will even provide you with all the local tips, to go places and any assistance you need with car rentals, boat tours etc.
4) They are very professional.
Negative:-
The only negative I have is the location of this place, its way deep inside, you will never be able to get to the actual place on your own for the first time. That's why Eleni and Anthi employ someone to meet you at a landmark and guide you to the place. This should not reflect badly on the place itself, the place is amazing but you are a little distant from the action in Fira and Oia, it is pretty close to the black sand beach though.