Panos is great!! He waited in front of the building for us until we arrived in our taxi from the airport (roughly 35min). Got us a whole case of water to utilize. Gave us tips for great nearby restos. Responded to my text within minutes. Let us leave our bags for a few hours after check-out. The location of the flat was AMAZING. Right around the corner of Monastiraki Sq, basically a 15-20 walk to Acropolis/museum and all the neighboring sites. Near tons of streets with all the outdoor seating/bars, so beautiful! Also near the main shopping street. The flat hovers over a street of bars/restaurants that were also great. The sound didn't bother us at all--you can hear the noise a bit, but not bad (and we're also easy sleepers). AC worked fine, even got a bit cold at night.
Wifi worked great. Area seemed safe, esp since there's always people hanging around outside due to the bars/restos, so it's not quiet and scary; the area is lively.