This house is truly in a pristine location, you can't get much closer to the sea than this. The location and layout of the house is in itself fantastic!
Panagiotis has also made a good effort trying to convert it into a decent living space. However, we felt there were still some steps to take before that transformation is complete and the value is more in tune with its price. A combination of small faults together with a pervasive smell of moisture with earthy notes, as well as the general feeling of old and worn made us leave this accommodation prematurely for another option.
Perhaps the smell is from all the old textiles in the house, or perhaps the rock formation inside has a buildup of some algae or mold and needs a good clean down. Whatever it is, this and some other issues (leaky taps, blocked drainage, gaps under doors blowing in dust, etc) can and have perhaps already been addressed by Panagiotis by the time of this writing, and if so it's a real gem for space!
Last note, one should also consider that this exposed location on the northern side of Tinos seems very vulnerable to the etesian winds of the Aegean sea, more specifically the northern Meltemi, which during our stay blew at a constant (yes, every second 24/7) 10 m/s in mean speed, with gusts up to 20 m/s. Check the weather report!