Landlords are parasites
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National NO KINGS Rally is tomorrow! Saturday, Oct 18th - Find a local rally in the post body link! #50501
I think in most cases, short-term housing as you describe would be best served by more dense apartment complexes that are maintained by the community, and the people who stay in them for those short periods. They would be maintained in the same way that public transport or libraries would be maintained, as a public resource that everyone has access to and needs.
The benefit to those who maintain such complexes is that they would also freely have access to use such facilities in other parts of the country. This is not terribly dissimilar to how individual Native Americans were able to travel vast distances in America and expect accommodation from virtually any tribe they came across (that weren't hostile due to a larger conflict), because without such universal accommodation, each tribe would be limited in how far they could travel or trade. It was to all tribes mutual benefit to give each other that accommodation, in an early form of mutual aid (you can read more about that in David Wengrow's book, The Dawn of Everything, a very interesting read).
The Dispossessed by Ursula Le'Guin offers an interesting solution to that scenario. In that book, money does not exist, and housing is simply a right that all are entitled to. Couples and families are given larger accommodation when it becomes available, which is managed by an elected housing committee.
A single family home would be unlikely to be empty for long in a desirable area, so I don't think abandoned homes would be a significantly bigger issue than they already are under our current system. As a current example, In Japan, many smaller rural towns with dwindling populations have such an abundance of unoccupied homes, that they're actively paying people to move out to the area, and will sell the house for under $10k in the hopes someone will take them up and maintain it.
Only if they wanted to. There would be no one to force them to do such a thing. They may elect to do so since they would have much more free time in a socialist world (estimates usually suggest around 3 months of community work would be required to give everyone a good standard of living, with the remainder of of the year being free time to do with as they please).
How is that prevented in our current society? Many home owners let their home go into disrepair despite owning it. Sometimes this is done out of poverty, or a lack of motivation for upkeep. The only way to force someone to maintain their home in our current society is with HOA's who give fines or even jailtime to individuals if they don't. They don't have the most popular reputations.
Regardless, a community could decide to implement HOA-like rules if they all agreed to it, and then someone could decide if they wanted to live there and abide by those rules, or go somewhere where there aren't any (like our current system).