The decently sized room was just off from the throne room, at a bit of an angle. Sherlock could see some of the room from his seat,at least the front where the bars were.

So when John started to pace around, it got his attention. He had been deep in thought for hours while the man was unconscious, so hearing his name surprised him.

He walked over to the bars, leaning on them, watching the lightning crackle on and around him. It was a nice silent warning for John to not do what he was doing.

"Oh, yes. A bathroom. I keep forgetting you mortals have to stupid things like eat or use the loo. I conjured up some food for you." He drolled, sounding utterly bored.

A quick waggle of his fingers and there was something approximating a toilet. He of course had never needed to use one, so he had to guess at how it worked, but it was good enough.