Double room in Superbude was very comfortable, clean and uniquely decorated. It is larger than shown in the photos, which was a pleasant surprise. Staff was extremely pleasant and helpful, and the entire hotel has a very good feel about it.
They do not serve breakfast, but the cafe in the lobby has excellent pastries, cakes (homemade brownie was especially fantastic) smoothies and grilled sandwiches, more than enough for us so we didn't use the rooftop restaurant.
The only downside was the noise from Prater, as the rollercoasters were (figuratively) right in front, active until midnight. On top of that, AC wasn't working so the window had to remain open throughout the night because of the summer heat.
In conclusion, despite the minor lack of sleep, it was still a great experience staying in this hotel and I would book it again, making sure the room was on the other side of the building.