Superconmfortable especially if you have children.
The apartment is as described, clean, relaxing, and in a good position. It even has a dishwasher and a washing machine which are very practical, especially if you have children. In that case there are also some toys available, my children loved that. It was one of the best rations quality/price of my traveller's life.
Maria herself is really nice and helpful and lives just one floor above so for anything that you might need she is easy to reach.
There is a special care for details which make you feel welcome, from a Nespresso machine with coffe pods to apples, and other details which are very practical- for example you do not need to buy detergent for the washing machine or the dishwasher.
I personally loved the esthetical style as well, the neutral colors, the square plates, and so on.
There is a folder with a list of suggested restaurants, supermarkets etc nearby. The building itself is a beautiful historical building which will make your Viennese experience even more authentic.