Vaki and Mike's place is pretty great! It's centrally located, clean, and the communication was pretty alright. We didn't meet them because of the automatic check in, but they seemed pretty nice. The arrangements are quite strict, so we couldn't really store our stuff at the apartment for a couple of hours before checking in - though that's understandable.
Vaki left us a small gift which was really nice of her. Unfortunately, the cleaning staff were quite antagonistic to us, but it wasn't much of an issue!
The shower heating seemed to have issues, but the room was nice and warm! Overall we'd definitely recommend Vaki's place for anyone dropping by Athens for a bit