“Carmilla” is a semi-adaptation of the original Lesbian Vampire™ novella. The original novella is plodding, homophobic, and mostly only significant for helping to inspire “Dracula” a few years later- though credit where it’s due, there are a few excellent lines (one of which lives on as the tagline of the webseries).  

The webseries, meanwhile, is a character-driven opus that by all rights ought to be a steaming trainwreck- they’re limited to a single set and camera angle and can’t actually show much of anything important that happens- and ends up working on more levels than most of Alan Sepinwall’s “Peak TV” pantheon.