Karen was a welcoming host. On the first day she invited me to have Sushi with her and was friendly to talk to. In general she always was often for a conversation but was also fine with a quiet life each for oneself.
The neighborhood is good. There are only smaller streets nearby so e.g. sleeping with an open window is no problem. Shopping center Sihlcity and multiple bus and tram stations are reachable on foot.
In summary, my stay was nice and I can recommend Karen's place.

One note I have to make which might be relevant for some guests: the WiFi connection is not the best. Karen did her best to improve it but every few minutes there is a short connection loss, so continuous streams of data are difficult to realize.