Bump to say this is still valid. I booked it yesterday for a trip in December. There seems to be a blackout for the Christmas/NYE period. Wide available all year round otherwise, minimum stay unclear to me but it was available for 2 nights if Saturday night. No need for Saturday night if 4 nights or more. Possiblity to combine lots of LH group flight, I am flying with LX outbound, OS inbound.