Assume you have all the luxuries of a modern life in your Tardis (toilet, hot showers, TV, books, game console, …) which doubles as a mini self-sufficient apartment with it’s own energy stores and generation.
Where in history would you go if comfort wasn’t an issue?
*Teleports into the middle of the Black Plague. Starts handing out lifesaving antibiotics in plastic pop pill sachets*
“Uhhh, a normal product from the East… yes…”