From WoWWiki

The Servants' Quarters in Karazhan lies beyond the Gatehouse, and leads through a series of rooms via a ramp to the Guest Chambers. They are filled to the brim with spiders, darkhounds and bats, and also house the random beastly bosses - Hyakiss the Lurker, Rokad the Ravager and Shadikith the Glider. Hastings the caretaker can also be found in this area.

Subzones of Karazhan
The Banquet Hall • The Broken Stair • Gamesman's Hall • The Gatehouse • The Grand Ballroom • Guardian's Library • The Guest Chambers • Livery Stables • Master's Terrace • The Menagerie • Netherspace • The Opera Hall • The Repository • The Scullery • Servants' Quarters