Athens penthouse is an amazing place to stay!
I won't go on about the view as the description and other reviews do a good job of that... So instead I'll dwell on it's other strengths-
It is right in the thick of things, almost everything you will want to do you can get to on foot or by very easy public transport.
The flat itself is brilliantly newly renovated and decorated with a real eye for detail and understated style.
Every convenience imaginable is provided.
The place is incredibly clean and tidy.
The bed is super comfortable and the linen and towels soft and delicious smelling.
The only possible comment I can make is that if there was a way for the front windows to be fitted with safety locks that allow them to be opened from the top only (they are locked permanently for safety) then I think it would make an incredible difference- at the height the apartment is there is a lot of through flow of air that would make the flat a lot more comfortable- as it was we found it a little stuffy an uncomfortable in the front and were loathe to put the air conditioning on as it was only May. The back room and the balcony however have wonderful cross breeze.
If you can afford to stay there- don't stay anywhere else in Athens!