We have spent a lovely weekend here. It's easy to reach from Hauptbahnhof via U-Bahn, checking in took only a second, the room had a super design, the bed was really comfortable and luckily the window has good insulation and kept out the noise from Prater well. The whole vibe of the hotel is comfy and welcoming. There is an Israeli restaurant on the 7th floor with good view on Prater and the city but reserve a table in advance if you want dinner there, they are fully booked usually. However, you can get a nice breakfast there and also there is a Café on the ground floor to grab some sandwiches or pastry to eat and to have a coffee or a beer.
When we come back to Wien, I am 100% sure we'll be staying here again. I recommend you to do so also!