UPDATE from first post: When I complained to TootBus, they responded by refunding me 50% of the cost of the tour. I thought that was fair. I also recommend carefully thinking about what you want from a tour and do some research before booking. If you are looking for the lighted buildings, make sure you go at a time of the year when that will actually be possible. If you want good commentary all through the tour, I would avoid TootBus.
We were really excited about the bus tour so we could see the fascinating sights lit up at night. Unfortunately, we were there in early July when the sun doesn't set until almost 10 PM. The 2 hour tour started at 9 PM and immediately went past the best sights while they were still unlit! The Eiffel Tower, the Arch de Triumph, the palaces, the Opera, all unlit. The biggest problem was the lack of the audio guide!! The first hour or so of the trip there was no audio; also no explanation from the driver as to the lack of audio! We passed buildings we did not recognize and had no idea where we were or what we were seeing. At some point, the audio was restored but even at full volume it was not easy to hear. The audio broke up many times for long periods of time. We finally gave up trying to listen because it was more trouble than it was worth.
The final problem was the 2 hour bus ride with no restroom on board and no stop for one. My 12 year-old granddaughter had a real need for a restroom by the end of the trip. We got off the bus in front of the Louvre at 11 PM. Everything in the area was closed at that time!! We had to run with her about 5 blocks before we found a cafe where we could use the restroom and buy a coffee. No apology and no offer of a refund was forthcoming over the audio issue. I would avoid this tour as it was not worth the money we paid!!