In Sweden there is no housing specifically designed for low income families or low income individuals.
There are of course units for those with social problems, where rent is paid by the government. Such as "stödboende" for those who need support in some way.
Also housing designed for older individuals (usually 65+ or similar) as well as but those are not necessary under rent control.
What is most similar to public housing is "allmännyttan" which which consists mostly of flats owned by the local council. Unlike its counterparts in Great Britain, for instance, the Swedish Public Housing has never had any upper income restrictions, so anyone can apply for them.
The areas that tend to have the most lower income residents are the "million programme" suburbs. These suburbs were built during the 60s and 70s and 1 million homes were built during 10 years.
Some of these areas were attractive at the time, but many of them are considered unattractive today due to their "commieblock"-looks, and theres even proposals from some Political Parties to demolish some of them.
Below is Rosengård in Malmö, where Zlatan Ibrahimovic grew up.