I stayed in Rio's apt for 2 nights and it was really awesome! The apt is really cosy, and neat, ideal for solo travellers or a couple.
Located in the center of Athens, but in a beautiful and quiet neighborhood, just 3-5 mins walking from the main metro, bus, trolley and tram lines, which connect you to the whole city. Of course, it's also walking distance from the very centre of the city itself (5-6 mins to Acropolis Museum, or a 15 mins walk to Syntagma Square).
Rio and Maria were amazing hosts, kind and warm-hearted and they were keen to help out with everything needed. The apt. was delivered to me clean and with clean sheets, towels etc and having an a/c is surely a must in summer Athens.
I could not recommend it more and I will be surely stay again in Rio's place in my next visits to Athens. Thanks guys!