I know for the exact reason you said they've had housing shelters that all homeless people can sleep at for free. I got the feeling they were very barebones. As for locations for homeless people idk about the stats but I would bet my ass the percentage of Finlands population that's homeless is miniscule because it's so hard to be homeless there. Also, the total population is so small, but Finland is pretty huge, I'm sure they have more than enough room to house a bunch of people.