I'm seeing phrases like (gross cherrypicking, also doesn't represent the full picture article, I know, I know) '15 percent decline in the number of renters living in these buildings' and 'led to a higher level of income inequality in the city overall'. This and conclusions like a 5% increase in rents city-wide suggest that the policy is not improving the housing affordability situation.
Indeed, it looks like rent control is great if you can get it but is making any housing shortage worse.