The appartment is pretty good located in the centre of Plaka, just 2 minutes walk from the entrance to Akropolis and 1 minute from the metro Station.
It‘s pretty clean and has everything you need.
We stayed 2 nights in Grey Matter 4, which was good, as this Apartment is located in the ground Level, with just a little window. The bedroom doesn‘t have a window, just a small ventilator. So it‘s very humid and it doesn‘t feel very healthy to sleep in.
But the rest also the little garden inside has a nice atmosphere.