Positives: Great location close to everything, close to metro train stn and bus stop, with AC which is a big bonus. Bakery downstairs is lovely and reasonably priced.
Negatives: On a busy road so if a light sleeper, take earplugs. Arrived at 3pm on the dot and the key code had not been reset yet. If the cleaner was not around I would have been stuck outside. But once your in, you have your own set of keys which is great.
Tips: Take the Official Athens free walking tour on first day as a great orientation to the city, take a ferry to Aegina (1.5hrs) rather than Santorini (says 4 but more like 6hrs) or the 3 different island tours (more time on the ferry than the islands).