I've visited Oxford every year in the winter for about a decade, bringing a group of university students from the USA each time. We've used many tour guides over those years, with varying success. We found Heidi and Walking Tours last year, and booked her again this year. I can say without a doubt she is the best. As advertised, she customizes the experience, and she readily acceded to my list of special requests, helping our students to discover the magic of Oxford. We hope to work with Heidi for many years to come!