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I think it costs 300 or so euros and needs to be planned in advance as someone else mentioned. Unfortunately, I did not see it while I was in Santiago last week. They swung it a couple of days before I arrived. Pot luck I guess.
I was there in mid-August and the first room (closest to the entrance) was filled with them. We told the Italian man running the place and he didn't seem too fussed.
Needless to say, most of us didn't sleep in the room, but because it was too late, four of us ended up sleeping in the kitchen...
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