Today, I visited the sky terrace on the 60th floor of the DC Tower together with some friends.
We ended up there more or less by change: Originally, we wanted to go to Donauturm. However, the parking lot there was full, so we continued on to the DC Tower. The viewing platform turned out to be a worthy subsitute: Even though the views of the inner city were not that good (as there is a restaurant and bar on side of the building facing the city), the views of Transdanubia (the eastern part of Vienna, across the Danube) were great. What is more, the terrace was not crowded at all: Apart from us, there were less than ten other visitors.