I'm having fun playing through this one, although I do have a few observations (criticisms really) -
I'm not a big fan of death in interactive fiction, as it's usually just a 'dead end'. There's a point in Vampire House where you can die rather abruptly, due entirely to an arbitrary decision that boils down to a fork-in-the-road-type scenario (essentially "left vs. right"). Since you can restart the chapter instantly it's not a big deal, but the lack of feedback (in terms of knowing why you died - i.e. what it is you did wrong) is frustrating nonetheless. It's not particularly fun or interesting, nor does it add anything to the story IMO.
Also, the study vs. exercise (etc.) options don't seem to do much.
In that sense I guess the main weakness here isn't the quality of your prose or the pacing or the characterisation - it's simply that the cause and effect relationships (in other words, the ways in which the player interacts with and affects the story) can be opaque.
Other than that, you write well, your characters are interesting, and I look forward to making my way through Vampire House (and seeing/playing more of your work in the future!)