Gianna was an absolute delight! Very communicative (she'll definitely respond to you beforehand, don't worry), her English is great, and everything was super simple to understand - check-in and -out was a breeze. She even let me store my luggage on the property after I checked out (obviously out of view, reach and with no possible disturbance to the future guest). Very great host!
Honestly, the apartment's localization is absolutely top-notch, even a little undersold in the listing - right next to all the major bus lines and a 10 minute walk from the metro in a nice, safe neighborhood along a busy street with plenty of people, even if you're out later at night. I would easily recommend this listing to anyone, including female solo travelers, such as myself.
Aside from this, the localization is prime to be able to walk to the main sites in historic Athens, but there's also ample public transportation options nearby for those who don't like to walk. It was a 20-25 minute walk in the morning to the summit of Muse Hill, where I'd go every morning and some evenings to watch the sunrise and sunset over Athens.
The house was clean, the kitchen stocked with any utensil you may need to cook with, the smokiness from the outdoors does not easily get into the apartment (I believe this is what previous comments may have been complaining about - Athens is a European city with many smokers, but the apartment itself was certainly not smoked in). The bed is a bit on the harder side, but not enough to be a nuisance - I slept perfectly fine every night, as the building itself is quiet for a residential apartment.
The price was a steal - highly recommend!