This is my first negative review, and I've used Airbnb frequently for 5 years all over the world. I'd recommend everyone try a different Airbnb unless you're desperate. This was probably the worst interaction I've had with the host team. I'm baffled she's a superhost.
The Good: The actual Airbnb was comfortable for 4 people in the summer, traditionally Greek and air-conditioned. Location is central for Oia but read the section below. Host also provided juices and cake upon arrival. Espresso machine is a wonderful bonus. Each person also was given bathrobes! Host also provided toiletries and there was a hairdryer.
The Bad: First, as others have noted, it is a TREK to get to the Airbnb, be forewarned. I'm not someone whose shy of walking, and it was a good 10-15 mins from bus stop walk through cobblestones and stairs. Don't stay here if you have bad knees, joints or have lots of luggage. If you have any sort of luggage, you'll want to get a porter. Speaking of porters, the ones the host provided were rude and mean to me and my parents. Some of the worst service folks I've encountered, and I'm a frequent traveler. We paid the porters 20€ to bring 4 bags (each under 20kg) from the bus stop to Airbnb then same amount from Airbnb to bus stop, and they basically dragged all our suitcases across the rocky roads without any regard to damaging the suitcases. In fact, I even had an exchange with another porter along the way where he commented on how our porters were handling our bags. When my mother asked them to roll them more carefully, the guy snapped at her. Completely unnecessary. Thankfully we all had new bags and they didn't break.
We've had porters help us with luggage our entire time in Santorini while staying at other Airbnbs and they generally charged less (2.5€ per bag per way), and were significantly nicer.
As others have noted, communication with the host wasn't the greatest. I found that response times were just much slower than all the other hosts I've interacted with. An example - I was struggling to find the bus stop where we were supposed to meet as Google Maps wasn't giving an accurate location, and she was incredibly impatient on the call and eventually just stopped answering.
Perhaps Rena and team were just having a bad day, but it wasn't a pleasant welcome to Oia. I definitely think there are better places you can stay for the price.