I currently live and own property in an area where long-time rent control and affordable housing are significant issues. While the intent of affordable housing is worthy and needed, there are a lot of unintended consequences of bad rent control, that then tends to snowball into legislation after legislation to deal with it. 
Eviction control has to be addressed and regulations for fair/unfair evictions will have to be evolved. Rules and regulations of cost pass-thru's on top of permitted increases. The then there will be many tenants that occupy rent control units that are not in need, taking away from the available housing. 
Landlords tend to let not improve rent control properties and the general condition deteriorates. Also, rent control basically transfers the cost of affordable housing to a (narrow) private sector to subsidize housing costs. If would probably be more fair and effective to just tax everyone at the state level, do a family need analysis, and subsidize low income.