This place was beyond perfect! We have been traveling for a few weeks, and this was by far THE most comfortable place we have been. The communicability of the hosts was exceptional. Directions, as well as entrance instructions were crystal clear. The place is adorable, clean, and the bed was very comfy. All necessary amenities are available, and there are close stores if you need anything additionally. It's close enough to walk to both Monastiraki and Syntagma subway stations, and walking distance to pretty much all the big sights in Athens. We left several hours before our flight to checkout, and there is also a nearby business at which you can leave your luggage and see the city on foot if needed.
The only thing to note is there are two very busy/noisy restaurants right outside the entrance to the apartment. This was a non-issue when it came to sleeping, as the bedroom is on the opposite end of the apartment and was completely quiet for sleep, but if there are guests sleeping in the living room, it will undoubtedly be loud until the early hours of the morning on weekends (I cannot speak to during the week as we did not stay here on those days).
Very highly recommend this place and would absolutely stay here again if in Athens!!!