The location is super convenient, just right upstairs to Stuttgart Hbf. If you plan to stay 1-2 nights or just for transit to other cities, Intercity will be a good choice for you. I stayed at InterCity for 2 nights.
Overall, the in-room decoration is bit old and dim, but it can be accepted.
The Wi-Fi reception is not stable, my iPhone 6 cannot connected to Internet fluently.
The location is good, 10 mins walk to Schlossplatz. My room is at 3/F next to Taxi station, it's bit noisy during the night and some people were yelling. If you need a completely quiet sleeping environment, I would not recommend you to stay at this hotel.
In addition, 24 hr free transportation card is really good for travelers, save money from my pocket.
I would say, reasonable price with acceptable service.