My husband and I stayed here for 5 nights in October based on the reviews on here.
When we arrived we were given a lovely room but it did not have a stand alone shower so I phoned reception to ask if they had another room available. The guy on reception was very helpful and changed our room immediately.
Breakfast was good and included cereals, toast, cake, pastries and a few warm options.
The location was not close to the centre but we are keen walkers so didn't mind the 25-30 min walk into the centre. There is also a metro stop 5min from the hotel if you need it. Some reviewers have commented on the area surrounding the hotel. We didn't experience any issues when we were here apart from a few unsavoury looking characters in the area on one night but they were harmless.
Areos thoroughly deserves its high rating on trip advisor and I would definitely recommend it to anyone staying in athens!