We stayed 2 nights in a family room (with 2 teenagers), overall we liked the room however it was a little run down while the bathroom was brand new and very clean. We had a separate toilet that was very tiny (almost like in an airplane), but we found this funny thing rather than annoying.
We also pre-payed for breakfast and all of us could find our favourites (cold or warm) there.
We new the location and enjoyed its advantages (close to Prater, Danube River and Island, underground station, few grocery shops and take-away foods around). To find parking place in the neighbourhood was a little challenging (during the weekend), but still manageable.
Hotel has a little garden as well, that was a relaxing zone with few people only (in Autumn weather).