We arrived late at night (around 11pm) and had notified the host of this in advance and so had expected that somebody would be there to greet us. However, a mild panic set in as the first few phone calls and messages went unanswered (it turned out that the host had left his phone on silent mode!). Eventually, after 15/20 minutes, a nice lady who lived in the apartment block came down and let us in and showed us into the apartment.
The apartment itself was satisfactory and had everything that was listed and was perfectly adequate without being exceptional. The satellite TV system was a bonus.
Neighbourhood was ok. It's a little run down outside but felt perfectly safe. Lots of shops and cafes in the area. It was walking distance to metro (10 mins) and from there just a few stops to the centre of Athens so was great from that point of view. Unfortunately didn't get to meet Ioannis in person but after the initial issue with communication, was responsive in getting back to us with questions that we had.