Executioner's Tower
From Witcher Wiki
The Executioner's Tower is where we find Zahin Schmartz, the dentist and Old Vizima's newest amenity: a dental office. He has relocated to the structure upon discovering a complete set of tools inside, perfect for his trade. Did I mention that this place used to be a torture chamber ? But it's not all blood and guts, Zahin apparently has something of a green thumb as he's keeping a nicely potted wolf's aloe plant alive and despite his reputation, the dentist would never shirk his duties as a host and provides a nice little rug on which our hero can meditate.
