Ive also visited there on my first and only trip to Rome in the late 1970s. The place was completely empty and I had it all to myself.
I remember the amphitheater, a dining room, the latrines and then suddenly got the chills when I was in the building of the baths. To be in a complete Roman building was eerie.
Much better than Pompeii with its crowds. I would love to go back and hope to go back next year.
St. Monica, the mother of St. Augustine, died in Ostia.