Aris's place is totally recommandable for a city trip to Athens. It's in a really cool neighbourhood with lots of restaurants and bars. Also it's just a few minutes walk to one the main squares of Athens as well as close to most of the sights.
Communication with Aris is really easy and he provides you with all the necessary information and details (even a description of ways to get to the place from the airport or whereever you arrive). At our arrival, he explained everything to us.
The appartment is modern, clean, nicely furnished and decorated, quite spacious for two people and has everything you need. There was even some water in the fridge for us on arrival. The highlight, however, definitely is the rooftop terrace with amazing views of the Acropolis! (Only thing to be improved: access to the rooftop terrace - you don't get a key, so when it's locked you have try to call Aris to open it up for you. During the day that's not a problem.)