The place is very dated. Oia is very overrated and far too crowded. For accomodation you pay far too much for what you get. You are better off staying in Fira or another town and just going to Oia for a sunset dinner via bus or hiring a car for a day. You can get a much nicer, more modern apartment outside of Oia for much less.
While the hosts were very friendly and helpful with providing tips on what to do, we would not return because of the high price for a very basic unit.