What other details in the description of Zaroffs appearance, home, and habits suggest his concern with living in a civilized manner?

From the text:

Rainsford's first impression was that the man was singularly handsome; his second was that there was an original, almost bizarre quality about the general's face. He was a tall man past middle age, for his hair was a vivid white; but his thick eyebrows and pointed military mustache were as black as the night from which Rainsford had come. His eyes, too, were black and very bright. He had high cheekbones, a sharpcut nose, a spare, dark face--the face of a man used to giving orders, the face of an aristocrat. Turning to the giant in uniform, the general made a sign. The giant put away his pistol, saluted, withdrew.

"Come," he said, "we shouldn't be chatting here. We can talk later. Now you want clothes, food, rest. You shall have them. This is a most-restful spot."

The dining room to which Ivan conducted him was in many ways remarkable. There was a medieval magnificence about it; it suggested a baronial hall of feudal times with its oaken panels, its high ceiling, its vast refectory tables where twoscore men could sit down to eat.