We traveled thru Athens in September 2022 and planned a hop on hop off tour to fill in the afternoon of arrival. Our travel mates arrived at the hotel later than expected, so we were on the top level of the bus about 4pm, when it was very hot. The afternoon traffic made it worse, when the bus was stopped at lights there was no air, when moving it was fine. All that to say, if you want to do this in the hot times of year, make sure you go earlier in the day. We have used these tours in other cities and always enjoyed them, for Athens
we hopped off much earlier than we planned because of the heat and traffic. The audio on this particular tour did not seem to be a specific as som in past cities, I had a hard time telling WHICH building they were talking about with no distinguishing audio notes, it seemed to be generalized for most of the areas, unless the site was very big (like an arena). Maybe this was the heat getting to me too! For $20 it is a good way to see the Athens city.