This hotel is exactly where you want to be in Athens. It offers great views from either side (with the Acropolis side winning--IF you are on a sufficiently high floor.) You are in easy walking distance of all the major center city sights.
The rooms are modern and relatively comfortable. They are curiously floored in cheap, imitation "wood" flooring that squeeks, and the furnishings are sparse and a bit worn. For a hotel that bills itself as a 4 star, the rooms don't get to that standard.
I sent an e-mail to the hotel to ask if they could arrange for a driver to pick us up at the cruise terminal. Reply: "We don't make travel arrangements."
Service at the rooftop lounge with a magnificent view of the Acropolis and the Temple of Zeus was truly awful. While the food and drink at this wonderful site are quite reasonably priced, the service staff can't be bothered to serve anyone...you have to track them down and ask for what you want.
In summary, this is a nice, clean hotel just where you really want to be. The rooms and service are only "acceptable", but then, that's good enough for this stop on your journey.