There are indeed no hard caps. There is a formula that is used that takes into account various costs, such as heating and electricity as well as improvements made to the property, and using that formula along with the included utilities, a maximum percentage of price increase is calculated.

It's generally under inflation. A typical price increase cap might be 1.8%.

For cases where the landlord actually asks for a hearing, the average is of around 2.9%.

If no major repairs were necessary, you'll see around 1% or increase, maybe a bit more.