I remember my last stay in the Steigenberger across from the train station (in 2006). Never went back because the brass/glass and blue carpet of the 1980s really turned me off and the rooms looked like those that I had at boarding school. In general Stuttgart, for such a wealthy area, has pretty rubbish hotels. I used to escape to the Bühlerhöhe (RIP) or other nice places in the Black Forest.