Katerina's place is located very conveniently for those wishing to visit the palace district. Just go out the door and make a left, keep going straight. Go through a pedestrian tunnel under the main road, not down the auto tunnel, as (I did, until startled drivers honked at me). Go up the cobbled pedestrians-only lane, and into the castle area.
Katerina's place is clean and bright. There is a large window overlooking a garden. The bed is very comfortable, and Katerina provides all you need for cooking. Though I didn't use it, there is a TV and stereo setup for people who enjoy these things.
The building is very quiet. There is a bit of "people noise," but nothing obnoxious or even very noticeable. Just enough to know there are other humans about.
Katerina's son lives right across the hall in case you need help. He used a map to direct me to several grocery stores. It took my just a few minutes to walk to a Billa and get provisions (bring your own bags or buy them at the store!).
I was surprised and pleased to find the apartment contains plenty of electrical outlets.
Overall, this place met and even exceeded my expectations, especially with regard to Katerina's friendly pre-trip advice and assistance.