Overall: Cheaper than most in the area; it's a reasonable value. Amenities (shower, toilet...) not in a good shape (loose screws, peeling paint, water leaks...), but ok clean. Comfy couch and some guidebooks left around (nice touch). Quiet area. It's ok for airbnb; don't forget this is not a hotel.
Details:
Good communication and check in/ check out experience. We were there in winter, quite cold weather. Heaters you see in the pictures don't work, heat is provided through the air conditioning unit, which works sort of ok (not great, and is requested to be used in a limited fashion, and is a bit loud - all of these issues are normal for this kind of heating; they're just not used to cold weather in Athens I guess.).