The first impression of the metal doors & shops around the building might not be the best but once you access the hall with the rooms the impression starts to change, open your room and you'll quickly change your mind. It's a very well laid out & bright modern room with everything you might need for a great stay. Excellent location on a pedestrian only street that's very close to Syntagma station (direct rail access to the airport for 10$), also within walking distance to nearly all historical places of interest.
I wasn't able to leave my luggage at the listing before check-in or after check-out, but there's a nearby luggage storage facility that's en route to the station. The only, and very minor, inconvenience is that the doors in the hall loudly slam shut if who ever is outside isn't careful, but it's a rare occurrence (when I was there).