Topkino is the main arthouse cinema in Vienna, at the same time it is a very popular restaurant/bar, depending on the day time. In summer there is a little outside sitting area, perfect to relax after spending the day at one of the museums of Vienna, which are quite close.
The staff there is really friendly and the people you'll find there as well. The design of the place is very typical for the youth of Vienna, hip with a bit of shabbyness. The food and the drinks are delicious and are local average.
If you speak German you can also watch a movie there.