Our stay in Athens was lovely. There are a few pros and cons to the apartment:
Pro -
Location wise, it was fairly central; clean, modern, pretty, comfy and well equipped. When we had a query or concern it was answered immediately - Alkis also provided delicious pod coffee and toiletries which was a lovely surprise. House is also very secure and safe.
Cons -
No washing machine despite advertised, apparently one can be put in if your stay is over a week; there is a noisy train right across the road which runs from 6am - midnight and the brakes squeal right outside the apartment.
Also you should be aware the neighbourhood is a little iffy, so not the best place if you intend to stay out late - but in the day it felt quite safe.