This is a 3 star hotel at best. They may have been 5 stars 30 years or so ago, but the property is dated and has been poorly taken care of. The wallpaper is peeling away from the walls, there were tiles poorly plastered as replacements in the bathroom, etc.
The only real reason to go to this hotel is the view. I paid extra for a room upgrade, but had also booked one night at the hotel using credit card points, which only let me select a cheaper room. They gave me the cheaper room for all the nights, rather than switching our room. They told me it was the correct room and that they upgraded me for the first night. Either they were lying, or the rooms with the acropolis view don't have an acropolis view. If you leaned over the balcony you could see it, but you definitely couldn't see it from the room.
I'm not usually someone to care about service, but when booking a 5 star hotel, it's one of the things that's meant to be differentiating. The staff were rude at check-in, rude at breakfast, and were not only rude, but also unhelpful when I left something in the room and needed to have it sent to my next hotel.
I stayed in a boutique hotel later in my trip that was considerably cheaper, and the staff there were incredibly nice.
Don't expect this to be a 5-star experience. Save your money and stay somewhere else. It'll have nicer rooms, and friendlier staff. Maybe come here for a drink for the view.