Thierry was a great guide. He explained what all of the sights were and answered all of our questions. The only reason I am rating a 4/5 is that the experience was exactly as described. There were no added touches that made it extra special. However, that being said, Thierry was wonderful, and I would highly recommend the tour for anyone spending 4+ days in Paris. Paris has a lot going on, and if you're looking for a relaxing tour of central Paris, this is for you. I highly recommend it.