If there is an electrical outlet on the wall below the cabinet, it would be reasonable for a tenant to assume it okay to place in that area appliances like toasters or coffee makers or crock pots. But most people should know better than to plug in a heat-producer like any of those and place them directly below the cabinet when in use.
Are you wondering if you should deduct from the tenant's security deposit the cost to repair or replace the cabinet?
I think you have a good argument for a deduction, as "bubbling" the cabinet's finish is damage rather than normal wear and tear. Whether you want to give the tenant a break and eat the costs of repair/replacement yourself, though, is a decision you will have to make on your own.