Everything was excellent, we saw all the places and took many photos. The guide was speaking good English and gave thorough explanations of Greek historical and mythological events related to each place.
A few problems include that some people did not expect that dinner was not included. Also the bus stopped for a dinner at pre-selected restaurants where the food was sometimes not the best.
As for the but tour part, we saw Acropolis from below the hill, a couple of monuments in Athens, and that's all.
Also, our guide had terrible English, it was difficult to understand him.
Musical instrument museum was interesting but small. People who are not interested in musical instruments would find it boring.
Most of the time was spent in "New Riga" restaurant where Greek musicians played Greek music and a theatrical group of emigrants from former USSR performed various Greek and Arabic dances, also involving the visitors.
That part had actually very much fun and everyone enjoyed it.
However this excursion was not that you expect by its name, Athens Sightseeing.