How frequently may a landlord request access to an apartment for a "walk-through"?

Question Details: I have been in this apartment for 4 months and the landlady requested a "walk-through" after 2 months, plus she has done 2 more since. This is feeling very invasive and harassing. She claims that there is a "horrific" odor from my cats which is completely false. I have had the city code enforcement officer inspect the premise and document that there were "no discernible odors present". The place is spotless as I would not have it any other way. The LL continues to request "walkthroughs" - once with a strange man (I am a single female who lives alone) and has threatened to start the 30-day eviction.

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