Oh and so far those who have stated a preference seem to prefer the closed setup. I have one vote for twist, one vote for Lovers and two votes for closed.
For the new ones: open setups are those, where all roles that are in the game are known and all the mechanics are known.
in semi-open setups there is usually a list of roles that might be in the game, but not all of them have to be present. Usually the mechanics are also known, apart from maybe a twist or so. So while it isn't precisely know what is in the game, it is at least known, what roles aren't in the game. (so scum can't claim to be a role that isn't in the list)
In closed setups, all roles are secret. This allows scum to come up with outlandish role-claims that are too crazy not to be true. Some people (me included) like this kind of game because it opens the gates to creative ideas from the mod and from players. But it is more difficult to make out what can and what cannot be true.
In this case I can run the game as an open, no roles at all game. I always wanted to try that. That would mean that this game is pure social deduction without being able to resort to Cops or other investigators.
Or I run it as closed game, which fits the 'you all stumble into a haunted hotel and don't know what to expect' setting. So it's closest to the flavour.
Or I can make a list of possible roles that might be there, but include a twist. I.e. one or two of the possible roles might work a bit differently from how they are described on mafiascum.
So far the closed setup has a majority. If no one yells a veto against that, I will prepare that.