Trinity College in Dublin.
My favorite character was Renfeld, portrayed by Paul Pecorino. He ran about in a straightjacket delivering in his madness lines from Percy Shelley's "Ode to the West Wind" among other things. Alas, I never ran into Shelley himself, though Mary Shelley is supposed to appear on some nights, along with Lord Byron and Sigmund Freud for some reason.
Like with Sleep No More, audience members are all supposed to be masked. Those with glasses sometimes had a difficult time with this, but you can put your mask over your forehead, and no one will mind. The dress code is all black, which is good, as any speck of white will shine brightly in the venue's lights. Some of the audience members last night were even better costumed than the actors!