We have enjoyed our previous tours with Athens Walking. Despite our guides apparent knowledge in the art-she was difficult to locate at the meeting point-no sign. I was going around the metro asking people if they were our guide. Another family was added without explanation by the guide. I had booked our private tour 5 months prior and the other family said they had just booked the day before. Our guide took us to the Athens subway and did look back to see if we were with her and the doors closed leaving us in the subway. She pointed to go ahead. We got off at the stop they we thought might be nearest the Archaeological Museum. I finally got a call on my cell paying the international fee to cover the group. We wanted to stop and rest after the walk to the museum,but the other family needed to get to another tour-so the guide deferred to their needs. We did not agree to her proposal that we sit by ourselves while she gave them a quick tour of the archaeological museum. Our tour was to be 5 hours-we did not plan for 7 hours. I told the guide I was expecting a private tour and she said she was told she would have another group. 8 hours after the tour the owner called our hotel to state a problem occurred and offered a 50 discount. He Kosta or the guide should have addressed this at some point during our tour. The other Viatour private tours in other countries were excellent and private. Would highly recommend Fez tours in Istanbul. Be aware that a private tour with Athens Walking may be a small group tour. In conclusion of conversation with the owner did he offer full compensation but i would have much preferred the day I had booked months in advance or an upfront explanation from the guide at the start of the day.