At first sight the place is rather nice, high above the rooftops of Plaka, though the roof terrace is very windy - not always the most pleasant experience. Plaka in itself is very small and pretty much seen in half an hour.
For us, the whole experience totally changed on the second evening when the water suddenly stopped in the middle of my shower - I had literally shampoo in my hair. We reached out to the owner who showed up a little later to tell us that there had been a water outage in the village for the past three days, and now also the water tank of the house had been consumed to the end. At no point before had she told us that we should conserve the water. There were also new guests checking in to the guesthouse the same day when the water stopped - even though the owner should obviously have known that we had almost reached the bottom of the water tank. I think these two facts, that we were not given any warning and that new guests were taken in, were totally unacceptable. We stayed for the night without showering and without being able to even flush the toilet, but on the following morning we found other accommodation and cut short our stay at this guesthouse. This caused some fuss with the owner but we were very happy with the support from Airbnb.
Based on our experience, I can't recommend this place and I would advise staying in Adamas which is a much livelier place than Plaka.