The apartment is absolutely fantastic and the attention to detail in the little things throughout the experience really sells it. Check-in was seamless, and the hosts were almost immediately in touch despite me failing to properly understand the initial instructions and/or reach out to them. Although we were short on time and didn't take advantage, they also offer a ton of free advice and also offer formal tours for those who would like it.
As for the location, I cannot say enough good about it. It is central to some of the best eating, drinking and sightseeing in Athens, and nothing can replace waking up to a view of the Acropolis. If you are a history nerd, you will have unspeakable joy at being able to wake up at any time and take a stroll through some of the most storied places in history or even something simple like grabbing a fredo espresso outside of Hadrian's Library.
Can't say enough good things about the stay. The entrance hallway may trick you initially, but I cannot stress what a great idea it is to book this place. I intend to rebook the next time I am in Athens and you should too!