If I cancel my annual pro subscription, when is it effective?

My annual pro subscription runs into April. If I cancel it today, does anyone using it lose access to those rooms immediately (now in January when I hit cancel)? Or, does it run through the end of the year and then just not renew?

If just cancel the subscription you won’t loose access access at all. You will just loose the PLUS/PRO features (no ads,…) when the subscription runs out.