Why not? They have barns full of hay in the US, don't they? Just because you have a certain standard of technology doesn't mean that it's ubiquitous. We have houses with all kinds of modern gadgets next to barns full of hay. Why shouldn't the Timelords?
And since the couple looking after the Doctor were dressed in an old-fashioned way, maybe this was some sort of eccentric theme house, anyway. This is a planet with a Death Zone and hermits living in the mountains (and behind the Doctor's house) so everything's possible, really.