Francis's place is excellent! The views of the Acropolis are outstanding and the location is very close to the metro as well as some excellent restaurants and bars. Francis even went out of his way to setup a private transfer service to the airport (40 euro) for myself and my wife which was much appreciated on a long day of travel back to the US. The only negative is the immediate surrounding area the apartment is located in initially felt unsafe based on appearance, but my wife and I never experienced anything from any locals to back that up even when walking home late on a Friday night. This isn't anything that Francis could change, but may just be due to my unfamiliarity with Athens (first time).
Overall, it was a good experience and I would highly recommend this apartment.