Thelma was our guide for 8 of us. She was young, VERY professional and knowledgeable, and had enthusiasm for her job as a guide to her beautiful city. Her language and commutation skills are excellent and her sense of humor set the tone for a comfortable full day of touring. It would take way too long to detail how great her tour was....but high points were: excellent driving skills and knowledge of less-traveled routes, access to the best views, historical sights, and historic shops and food offerings. This was a highlight of our 3-week tour to Europe. I'd recommend this tour, Viator and Thelma to anyone visiting Lisbon!