What is there not too like: lots of history and beautiful architecture, all within a very compact area that can easily be walked (with the exception of Belvedere and Schönbrunn).
Vienna offers some of the world´s finest museums, great music, excellent restaurants and great shopping (except on Sundays).
Much of the inner city is pedestrian area, filled with lovely cafes, great for enjoying the wonderful Viennese coffee and cakes and people watching.
There are lots of things to see and do all year round, there is never a bad time for Vienna.
Come and enjoy!