FWIW, not cheap, but Stevenson Warmlight's hand made 5 person Hoop tents are pretty darned light
the Golite single pole teepee tent is also really light even in 5 person size,
(silnylon fabric is about an ounce a square yard)
but , I suppose there is still the individual's sleeping bag to contend with.
all .. pension/zimmer and hostels would mean reservations made and kept .. planning.