We received an email that our pickup at the Hilton would be at 2:30, but it arrived at 2:10. We were ready, as was another couple at the Hilton. This was the final pickup and there were a total of 9 tourists - all English speakers. So starting a little earlier than advertised stretched the tour as it still ended at about 5:30.
The tour includes stops at the Plaza de Mayo, La Boca neighborhood, and Recoleta Cemetery with about 30 minutes of walking time at each location. It also drives past other notable places with very good commentary.
Our guide, Marianna Menendez, was excellent! She was very knowledgeable, engaged and friendly, and a good shepherd. She is a native of Buenos Aires and her commentary immeasurably added to our understanding.