The car rental company's address changed two years ago, but ZuzuChe's offline map still directed us to the old address. We couldn't find the rental point at all and had to ask many people on the street, including police officers, but no one knew. Eventually, a local told us it had moved to a nearby street. We wasted an hour on this! Returning the car in Vienna must be done at Vienna airport, which is unreasonable as we wanted to explore the city. Thankfully, a local advised us to call the rental company and arrange to return the car at an underground parking lot in the city center, saving us a trip to the airport!