Location: couldn't be better. Just off of Syntagma Square, & you can take the X95 Express Route (5 Euro one-way) to and from the airport in about 50 minutes--and the buses run 24 hours. You can also take the Metro, but they don't start running until about 6am (which was later than what we needed for our early flight). Within walking distance of all the ruins/archaeological areas, and there's a great view of the Acropolis from the rooftop gardens.
Wifi: costs 5 Euro for 24 hours. We opted to not buy it & just use the business center in the lobby.
Rooms: Big, clean, nice balcony overlooking Amalias St, tub in the bathroom.
Breakfast: the biggest selection we saw during our honeymoon trip. Everything from a yogurt bar to scrambled egg/omelet bar, tons of fruits/meats/pastries. Breakfast is served in the Mezzanine dining room which is big & bright & a great way to wake up. However, if you don't order the package that has the "Deluxe American Style Breakfast" included, it's about 17 Euro per person to eat there.
Staff: front desk staff were accomodating, but don't really bend over backwards to help you out. Dining room staff were very attentive.More