READ THROUGH THE REVIEWS
Other customers apparently had the same experience I did.
I messaged a month in advance about my girlfriend joining me in a "one person" room (we share a bed). The morning of the reservation check in, I got a message saying I could pay 50% more or cancel the reservation. I felt swindled.
I called airbnb and they supported her decision. But then when I paid the extra, we didn't receive accommodations for two - we didn't even get a second towel.
The room is located close to Monastiraki which is convenient, but isn't quite what's expected from the pictures.
It was a very frustrating experience, and while I was glad to have a place on the last night of a two week trip, I'd advise working with another host if you want a pleasant experience