The center of Vienna is the heart of the city, where you can find the most important historical monuments easily, without having to travel. The grounds of the Imperial Palace and the Opera House, as well as the Albertina or Emperatiz Sissi Museums can be found in this area, known as "The Ring". If you'd rather not walk, you can also take a tram to complete the journey. Why not relax with a slice of traditional cake and a coffee? I recommend the Hotel Soher, serving great coffee and cakes. Even in summer, the temperature isn't too bad, but of course the city is at its most beautiful in cold weather.