I've just spent 4 weeks in Dimitris & Elli's apartment and if it wasn't for lockdown I would have stayed much longer. The place has a really nice feel to it and is in a great location, with lots of nice bars and restaurants nearby. Dimitris very kindly met me at 4.30am to check me in which was great service, and he was helpful in providing some local suggestions. I was working from the apartment and had no issues with the WiFi when connected through the Ethernet cable so can recommend the place for anyone looking to work from Athens.
If I had to make one suggestion for improvement a few more kitchen utensils would be great (bigger knives, wooden spoon etc) and a microwave, but you probably wouldn't need these for a shorter rental, it was just because I was there long term. I'd definitely return to Athens and stay again at the apartment, and hope to do so once restrictions are lifted!