As is the case with many other subjects, they'll agree with a surprising amount of leftist points until you label them "socialism" or start referencing AES states. Progressive ones will agree with basically all our reasons about why landlords are bad, and may even agree with "we should just take their rental properties" -- especially if framed in the context of local reactionary landlords and their influence on local politics -- but you'll lose them talking about Mao. Your more mainstream Dems might draw the line at rent control, but will at least talk about it, and will nod along to everything you say about enforcing existing housing laws or expanding renter protections.

You'll of course have some neolib psychos or lib landlords who'll have far more reactionary opinions, too.