I have also been reading Carmilla, the 1871 vampire story, which I am finding both fascinating and hilarious. It's interesting to see such an obviously lesbian character in an era I did not expect to see it, and of course the influences it had on Bram Stoker.
I wouldn't say it is particularly well written, and certainly can't compare to Jane Austen's prose, though some of this may be due to its having been released serially. As such it has very little subtlety, but this is what makes it so funny. Between Carmilla's strategies to throw off suspicion, and Laura's complete obliviousness I can easily imagine some Kate Beaton style comics about it, and if you haven't read Hark! A Vagrant, you definitely should.