"This is your home?"
Severus doesn't reply; it's a rhetorical question, after all. Karkaroff absorbs everything quickly, as there isn't much to see: bookshelves, mostly, with some dilapidated old furniture clustered in the living area almost as an afterthought. As they step forward, Severus lights a candle-filled lamp with his wand.
"I apologize for the...ah, state of things." The young man's mildly sarcastic civility never fails to amuse Karkaroff. "I assume you're used to better, coming from Durmstrang."
Karkaroff chuckles, habitually stroking his dark goatee as he peruses the rows of books.
"You forget, Severus – I was a teacher."