On the whole pretty good, but let down by a couple points.
Firstly, I was very disappointed that the restaurant closed earlier than the time stated on the welcome letter, and also that they don’t offer Room Service. Still Uber-Eats came up trumps., with both myself and another group ordering from the same pizzeria at the same time (which added some amusement when both deliveries were made by the same driver, and I nearly lost my dinner to another hungry diner).
I also had to fix the shower bracket in the room myself which should have been picked up by housekeeping/maintenance. Still I was staying for work so had screwdrivers in my luggage.
Location is convenient for Stuttgart train station (10 minutes walk). Sauna facilities are good. Breakfast was perfectly acceptable.
Interesting building, in that it seems to be a modern building inside the shell of an old one.