Cramped single-room-occupancy hotel units in Chinatown, traditionally living quarters for immigrant families, have recently caught the attention of community housing advocates because it appears some are being marketed on websites as short-term rentals, potentially opening a new front in San Francisco’s housing battles. Chinatown community advocates warn that this latest trend of placing SRO units on short-term rental sites, such as Craigslist and Airbnb, could exacerbate The City’s housing crisis by displacing vulnerable families, many…