Surprisingly nice! I’ve been in several hotels in Athens, all of them were more expensive (some even twice the price of Arion) and this one was the best. Nice, clean rooms with enough space; clean spacious bathroom; decent breakfast; good service. Location is great, of course, it is in the city center, near all the restaurants and the pedestrian area. And near the Acropolis, of which there is a magnificent view from the rooftop terrace. The only downside can be the noise during the night.