We didn't met Vesna and Kostas, but Danilo gave us a warm welcome, and gave us help and informations during our stay. The apartment was clean and comfortable and our expectations were met. It was well equipped and we didn't missed anything. The environment was quite peaceful, and since we slept in the bedroom toward the backyard, nothing disturbed us in the nights.
About 20 minutes walk to the Acropoli area fit us very well. A little shorter walk and we could take the Metro from Syngrou-Fix.
We can really recommend this apartment; it was one of the reasons that that our stay in Athens was a success.