This is really a nice hotel. Customer service is friendly, comfort is good, cleanness and wifi are above average.
My room was on a high floor, so it was very quiet, too.
Oh, and breakfast is also good!
The location is not in a touristy area, but it is in walking distance (250m) to the metro underground at Omonia Square.
The one fun thing would be the elevators, that are either for two people, or only one person with a bag.
I can recommend this hotel.