"Do you really wish to know?" Spoilers from the books and/or games to follow!
The Vilmerius Hospital, named after an unidentified
Vilmerius, is three-storey building located in northeastern part of The Bits district of the Free City of Novigrad and the chief surgeon is Joachim von Gratz. Due to recent conflicts, this hospital has had to turn away many of the wounded, as the richer and more influential families receive treatments before the general populace.
It's a place where Priscilla convalesces after she is attacked and Geralt can also bring here an injured witch hunter for treatment.