We stayed in the apartment for one week with 4 girls. The apartment was very clean and exactly as described. Dimitris was very friendly and communication was easy and very good. The apartment is really central and in a lively neighbourhood so you can walk to everything: the ancient quarter "plaka" with all the antique buildings as well as many typical and really nice restaurants, tavernas, bars, shops etc.
I would recommend it to my friends for a trip to Athens.