Dimitris' place was excellent - great location, very clean, had everything you would expect in a holiday airbnb flat. It is very close to some of the main tourist sights (the Acropolis and Syntagma Square were 10 and 15 minute walks, respectively). Also a 10 minute walk from a collection of local restaurants, away from typical tourist prices.
Dimitris and his wife were great hosts - they were very quick to sort out a problem that was out of their control, and very communicative throughout. Dimitris even offered a short tour of some of the nearby essentials (supermarket, bakery, cafes and restaurants, etc).
All in all, we had a fantastic stay, and would fully recommend any visitors to Athens to stay here.