In Montreal we've had universal rent control all my life, and it actually works quite well. The rents are comparatively low. We have a decent tech scene, but it's still an affordable, left-leaning city, where even struggling artists can scrape by if they want to dedicate themselves to artistic work. I'm sure some people would argue that apartments in Montreal are less well-maintained as a result of universal rent control, but I've lived in the bay area, been to San Francisco many times, and uh, a two-bedroom San Francisco shithole which rents for over 3000 USD/month would rent for about 700 CAD here (~550 USD). If you go to the 800USD/month+ range, you can find very nice apartments.

Funnily enough though, I would say that Montreal has less of a supply problem, despite being on an island with no room to expand into an infinite suburban sprawl like the bay area has. Construction still seems to happen here. People are bitching that too many condos are being built, but I think more supply is good.

Anyway, I think rent control can work pretty well, as exemplified by this Canadian city. At the very least measures to prevent surprise rent tripling while someone is renting an apartment are very much a good thing. Sidenote: I think that rent control can also help prevent property price explosions. It makes no sense to buy an apartment for over a million dollars when its rental value is only 1000/month.