I had a one-night stay here. Booked standard room, pre-arrival upgrade to a superior room which is a bit larger.
The entire hotel still looks modern and fresh and so did our room. Everything seemed in working order.
At check-in with my partner I received a welcome-drink voucher for 1 person. On request, no additional voucher available.
Staff were very pleasant. Housekeeping was absolutely friendly and did a very good job. Breakfast was above average in terms of service (attentive) and buffet (good quality items).
The only downside thing is the hotel location: there is a bus going to either Bad Cannstatt (railway station and a one stop S-Bahn ride to downtown Stuttgart) or to Schlachthof which is connected to a tram stop (U-Bahn, since it runs underground in the inner city center). But both ways it is a bit out of the way.