https://themarblesuites.com/location/

Reaching the building with a private car is also easy.

You’ll have to pass in front or Syntagma square and take a right on Mitropoleos str.
Take the second left (on Voulis str, at the corner of Electra Hotel) and then the first right on Apollonos str.
In 200 meters and just after Kimon hotel you’ll see a pedestrian on your left hand side. That’s Agias Filotheis str.
Take a left on Agias Filotheis pedestrian str. (you may do that for a moment to unload your things).
Drive just 40 meters more. It’s the modernist building on your right hand side with the marble facade.
The entrance is on 2 Agiou Andreou str, the first little street on the right. But don’t turn there because it’s a dead end and you’ll find it hard to go back.

In order to leave with the car you’ll have to back up.