Sisi museum. You will have two afternoons free and doing one museum per afternoon is optimal. Grab a sausage under the green rabbit which is the typical meeting point. The opera house is right across the street and is beautiful and see if you can tour it
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I enjoyed the Freud Museum, Palace and Gardens of the Belvedere (Gustav Klimt Collection is in Upper Belvedere).
Sisi museum. You will have two afternoons free and doing one museum per afternoon is optimal. Grab a sausage under the green rabbit which is the typical meeting point. The opera house is right across the street and is beautiful and see if you can tour it
Albertina Museum