Everything was good but for one exception... Renting me a bike helmet. Especially, when you're…read moretelling me that "no one rides in Vienna without a helmet. Do you want one?" Sure, I said. That'll be 6 Euros. I thought, "really?" When it's safety related and you wouldn't ride in town without one, how can you charge anything to provide a helmet on a bike rental?
Again, the rest of the experience was fine, considering the language barrier
Just food for thought, the other place I rented a bike in Firenze, included a helmet for 0 Euro.