We used Sabrina Z for two tours during our stay in Rome. A friend had recommended trying to see Ostia Antica during our Roman holiday so after we toured the Coliseum with Sabrina, we arranged to do Ostia Antica a day or two later. Sabrina's archeological knowledge was incredible and really made the tour of the ruins a great experience. Can't recommend her highly enough and we will use her again when we return to Rome!