So the Benaki was my third museum of the day. Its basically the collection of one man, Antonis Benakis, contained in his elegant neo-Classical mansion. Its a collection of everything Greek, from prehistoric to modern. The way I would describe it is that there is nothing to particularly draw you to it, but if you get there you will have a perfectly good time.
the only irritation when I was there is that to feel "relevant" they had a series of recordings of interviews with artists on video screens in each room. Inane chatter.
They also had a couple of full rooms displayed.