Used them to and from the airport. We had the same driver both ways and he was excellent. Called right before he arrived to make sure we were ready and let me know he was a minute away. Just wish they had a local phone number. I called Viator rather than the number of the voucher, which is somewhere in Europe.
thank you for your review and kind words. We are working on adding more phone numbers to the voucher, stay tuned! We are happy you enjoyed your trip, hope to see you again soon!