Staying at Steffen's place was nice. It's on the 8th level and from the balcony you can have a view of nearby hills. The room is spacious enough for one person. There is TV with Bluray player if you have some spare time to watch movie, which I unfortunately didn't have.
Steffen's place is quite easy to reach and you can go to Stuttgart city center using Stadtbahn directly.
The hand over of the key took place without problem. Due to an interesting circumstance, we did it at the train station. Later Steffen explained everything, e.g. bathroom and kitchen, and you could feel right away that you're welcome. It was also nice to talk to Steffen and Mika about many things. Due to works and some personal errands, I spent just a little time in the appartment.
But in general, my stay there was pleasant and could have been longer. :)