"Mixed feelings" is right. Rent control is one of those things I just don't know how I feel about.
I rented for many years and I remember that feeling of dread when the end of my lease was approaching and I knew the rent was gonna go up. It was awful. Now I'm fortunate enough to own a house, but buying a house just isn't an option for many people. It's not fair that people who can't afford to own a home can be priced out of their homes by rent increases.
On the other hand, strict rent control could also be seen as unfair to property owners. If they can't increase rents to cover costs or capture profits, there's less incentive for them to develop new rental properties, which means fewer units available to rent, which means higher rental prices on new units overall. The controlled rents may be good for long-term tenants, but lack of affordable new development can drive potential new tenants away.
This isn't something I've spent a lot of time studying so I'm certainly not an expert on it, but it feels to me like a better option than enacting rent control laws might be to encourage more new development of affordable rental properties. More supply will help keep rents low for existing tenants while also meeting demand from new tenants.