I'm picturing a simple, pretty normal land (compared to the grandeur realms of the Gods, Tempus doesn't really care much about it, also partly cause he's almost never home) that's fairly sized. There would be this consistent, grinding gear noise that almost always seems relative to the listener.

Most peculiar thing would be the room where he watches the timeline/timestream. It would be bathed in colours of pure white and gray, something like [url=http://vignette3.wikia.nocookie.net/tardis/images/d/d9/Doctor's_time_stream.jpg/revision/latest?cb=20130519054100]this.[/url]

Hmm another area he's particularly fond off is the terrace where he can watch (artificial) sun set through the meadows and bask in it's beauty.