Overall: the apartment description is accurate and everything a couple could need for a trip to athens. Would recommend to a friend.
Pros: The apartment is extremely clean, which is very important to us. The lift is very useful (especially as someone with asthma). The balcony is very cozy and has a stunning view, good for a night cap. The bed is very comfortable. The shower is spacious and the water pressure is powerful. The apartment is a 7 min walk from Monastiraki , 4 mins from Thiseio and 13 mins from Omonia. The roman agora, temple Hephaestus, Hadrians library and kerameikos archeological sites are extremely close by (5 - 10 min walk). George's recommendations were also very useful. Wifi worked well. George also kindly helped arranged a taxi to the airport for us. Towels, hair dryers and a few toiletries (from past visitors) were left available in the air bnb.
Cons: the front door knob is a bit loose and it worried us that it could break or be less secure. The bedroom aircon often makes clicky noises which woke us up a few times. George sometimes took a while to respond (after a few attempts), but when he did, he always answered our questions.