I had the chance to do a private cooking class with Andrea and I can only recommend it. Andrea is a very kind, lovely and interesting person and you will spend a very fabulous time in her company, during the workshop, as well as while having diner. It is good to know that she speaks several languages, including English and French.
Concerning the cooking itself, Andrea's recipes are amazing: they're delicious and easy to recreate at home (she sends you the recipes by mail afterwards!). The menu is also adapted to your needs or special diet (vegetarian in my case).
The 'Vienna cooking tours' is the perfect place to learn more about Austrian cuisine and meet a woman who loves what she does and passes on her passion of cooking to her guests.
Eloïse