This is definitely a favourite of mine from series 6 too. And I think the Minotaur is great—it looks magnificent and obviously far surpasses the Nimon who for some bizarre reason receive a namecheck.
One issue here is one which is common to loads of modern Who, which is that there simply is not enough time allotted for giving a tense build-up. Everything sort of happens at once and that means the hotel itself stops being creepy far too early. I would also question whether Rory really is supposed to have no faith whatsoever, which seems absurd; and why what we see in the rooms are quite so boring. Not even a single spider. I mean, come on.