Not worth the money. Wait very long time still did not see the bus coming. Definitely the frequency is more than 30 mins interval.
Note from Viator
Thank you for your review. We value your feedback and are sorry to hear that your Frankfurt hop-on hop-off tour was unsatisfactory.
As you note, sometimes things don’t work out as planned. The local tour supplier has a certain number of buses routing the city at one time, and the frequency of bus arrivals can be affected by adverse local traffic conditions and, on occasion, unexpected mechanical issues.
Of course there’s no excuse for poor service.
We rely on your honest feedback to help ensure the value and quality of our travel experiences. Based on your concerns, we have contacted the local operator and will continue monitoring feedback from our travelers.
Not worth the trip unless you are going for the spa in Baden Baden. Go for the Strasbourg is more wothwhile. But I was switched to the tour including Strasbourg w/o being informed beforehand and charged extra 10 EUR.
Value for money. Being able to see nice scenery and take the River Cruise. The guide (George) even bring us to some additional attraction as we are ahead of time for the cruise.