The hotel is located in a nice area: close to u6 metro line, restaurants, city centre, supermarket.
Breakfast has large choice and enough space not to feel crowded
The hotel is quite dated, but the bathroom is good, bed is comfortable. Nice to have minibar in the room. Nice to have gym.
What is bad is sound insulation. Even with closed windows you hear the traffic from big road under your windows. I couldn't sleep for 2 nights.
Another thing: not sure it's the case to all Austrian hotels or Leonardo chain, but the airo is central and can't be regulated in the room. In september when it was 26 degrees outside, my room was the same temperature. In October when it was 18 outside and quite warm inside, the airco was in a heating mode and not cooling. That provided with no possibility to oprn windows (noise) is the reason I would not chose the hotel anymore