We were unusual in that we stayed 7 nights so feel we really got a feel for the place. The location is awesome, right in the centre of everything but down a quiet enough alley to be not too noisy (don't expect it to be quiet, Athens is a busy and noisy city). The Acropolis is 10 minutes walk, Restaurants are everywhere and the train station is 1 minute away. The views of the Acropolis from the roof are amazing, you can just sit and stare! and the Patio out the back is quiet and relaxing. Inside is really spacious (for 6) with a nice large kitchen and Lounge (which would benefit from more comfy chairs/sofas). We also found the beds really comfortable.
Panos is the most engaging host I have ever experienced, there to greet you in and again to wish us goodbye. Very knowledgeable and super helpful, really goes the extra mile to make the stay fantastic. Always responding to any Whatsapp messages for my questions.
We also did a couple of excursions, the Monasteries and Delphi are well worth the effort, a completely different side of Greece from Athens.
Overall, I would highly recommend the accommodation.