There is so much more than the Acropolis to see in Athens. The sites are all located in the center of Athens but spread out. It is always very helpful to have a professional to point everything out to you and to provide you with all the necessary information. Being driven up to the entrance of the sites is an important plus too. We had a great tour (family of six) when in Athens with Nikos Loukas from www.privategreecetours.com
. I highly recommend him.