If your toilet clogs, you can usually get the problem resolved with a plunger. Simply push the plunger into place over the drain hole and after ensuring the lip is creating suction, begin to pump it up and down to move water through the pipe. Lift after several pumps to see whether the problem has been fixed.
Please be careful not to flush your toilet if the basin is full, as this could cause the bathroom to flood.
If you don't have hot water in your rental property, locate the heating tank and check the settings on the side. If you make any changes to these settings, please wait at least 20 minutes to ensure they can take effect.