I would say, let's just take it easy for a minute and let ideas settle so we can see more clearly. Anon has an appointment in a couple of weeks where she'll know more. That's not far away.
Then regarding a house as opposed to an inn/hotel, I would go for a house at least for a core group. Then an inn could be useful for people popping in for a night or two, or for late comers. A house is a better environment because of its privacy, no ears or eyes listening in to what is for many a delicate situation. Although we don't talk about MLC all the time, we certainly have talked about our personal experience at BD, the feelings of the affair, financial devastation, and that's only easy to open up about in a place you feel safe. So I would go for 1 house, plus name of a good inn.
Anon is brilliant at dividing up the expenses so that people now how much accomodation would cost them based on single or shared room. Someone else in our group might be good at numbers, too, and able to give those to us. Otherwise, everyone can go onto the links and work it out themselves.
Once it comes to the moment of securing the rental, a deposit will have to be put in place. I don't know how much, maybe 50% of the total (split between everyone based on whether they share or not). It will say on the link. You can all go on the link and work that out, too.
A deposit usually (based on the Tuscany experience) has to be done with a credit card. What we did for Tuscany, was have everyone send me the money through Paypal first, and then I used my Italian credit card. I can't do this for us this time. We would need someone to lend their credit card after having been credited first by the rest of us. I would say, let's just take it one step at a time.
My suggestion: those interested in coming, please check the links, where you have a favourite work out your cost and share it with us so it helps the others to get going. Some LBSs are able to afford their share without knowing the nitty details, but for those on a tighter budget, please could you take a look and share. Others will probably come in and add to it.
Treasur, the only thing I would ask you if you have any suggestions about an 'inn.' Otherwise, we can look up tripadvisor.