The view is amazing. Really outstanding. If you want to see the Oia sunset without the crowds this is it.
Be warned, there are ALOT of steps. Like whatever you're thinking, theres probably more. It's not a bad thing per se but it's a thing none the less. It's just the cost of doing business in Oia.
The bed is comfortable, the bathroom is spacious (after you duck your head to get in) and the kitchen has a fridge and coffee maker which is all we needed or used.
The roof deck is great, even when it's not sunset.
Everything about the experience was fantastic and you can't go wrong here (if you're OK with the steps).
Also, there is a pool a few hundred yards away that is "free" when you purchase an understandably overpriced drink. It's worth a visit after you climb up and down to amoudi bay or do the hike to Fira.
They are also very easy to communicate with (brought an iron, fixed the wifi) which is great for a host.