We stayed here for two nights.
The positive: The check-in was very easy. The location is really a dream with a beautiful view to the sunset.
After telling the ring boy Oresti, that there is no warm water before and after the first night it was fixed very fast. Oresti told us also on the first day, that we are allowed to go to the roof top because there was no booking on this day. It was really lovely for sunset there. Even Santorini is very crowded, at Kostas Apartment it was calm (exepted the other guests who are a bit noisy).
I‘m sorry to say also a few negative things which I have not expected for 196 €/Night. The toilet was really Dirty. It seems that nobody brushed it the right way for a longer Time. There was a lot of dirty sparks on the bedlines and bedcover. On the second evening the 4 people from the other room stayed in „our“ sunsetlounge and they hanged up their wet towels and swimsuits everywhere. Breakfast: It is meant nice but we had no table/chairs to sit and have breakfast (just 2 sunbeds outside). Price vs. performance was not right for us. I know that the Price is high for a place in this location but then please more cleanliness & perfection.