"I'd presume one of the empty residences that we passed when we left the graveyard would be suitable," he shrugs. He really doesn't care about John's observational skill, sometimes they were subpar.
As he's - not told John - he solves the case, John saves the life. That's how it works.
And, he'll accept that. At least - John doesn't know his wife, so he doesn't know to be unhappy.