The good: the place is in the heart of the old town, in Plaka. You are in the mix of everything, restaurants and shops. Terrace view onto Acropolis is great - and can be very relaxing in the evening.
The bad: this is not an owner-run place like AirBnB was meant to be. It's managed like a hotel by a management crew, but unfortunately they don't have the skill to run it properly.
I received no less than 7 automated reminders and check-in instructions prior to arriving, and when we finally got there, we discovered an apartment with an open door, some random people taking a shower there, garbage from previous guests in the kitchen and no linens on any bed.
Shocking. Upon further investigation, turned out people taking a shower were neighbors in the apartment next door who arrived shortly before us and the key to their place was not even in the lockbox. They just came all the way from South Africa to run into a closed door and no key. With our apartment clearly vacated, they decided to take a quick shower because they had to leave for a show at Odeon shortly.
So, two apartments that have not been cleaned, one missing a key and one wide open for anyone to use.
Despite multiple messages through AirBnB, nobody responds in chat - don't expect any responses. Luckily I had a Greek SIM card and was able to call. At 8 in the evening they picked up, apologized for the mix up and promised to try and get ahold of the cleaning crew. Knowing Greece I was not optimistic that anyone would indeed come late on a Saturday night and was prepared to search for a hotel.
But, the crew did indeed come, rather frazzled - clearly some internal communications were broken. They did a quick clean and left fresh towels and bath accessories. Unfortunately, working in a hurry, they still left garbage in the kitchen and the linens were stained.
We only stayed for one night transiting to the islands, so we didn't care as long as we had a place to spend the night. But if this were my primary stay in Athens, I would avoid at all costs.