Maria was an excellent host and provided many recommendations for things to do, restaurants to eat at and even discounts for many restaurants. Sergio was very helpful with carrying our bags around the hilly areas of Oia and being available whenever we needed assistance.
Helios cave house was beautiful! It was very clean inside, the loft was a nice addition and plenty of room for me and my husband.
The only reason I did not give 5 stars was we had some difficulties scheduling room cleaning in the mornings. We were very jet lagged coming from a 10 hour time difference and each time we tried to communicate a preferable time for cleaning the cleaning lady did not come at the time requested and usually came earlier. She also came the morning we were checking out and tried to clean our room before we fully checked out (which was weird, but Sergio was able to fix that for us after ~15 mins).
Otherwise, we thoroughly enjoyed our trip to Oia and staying at Maria's Cave House! Thank you, Maria!!!