I’m a tenant, and I wouldn’t think to ask the landlord to take care of an ant problem.
Had an ant issue a few years back, just got about 7 of those Terro liquid baits on the advice of a co-worker and placed them on the counters for a few days. The ants swarmed them which was kinda’ gross, but a few days later, they were all dead and I haven’t had an issue since.