Movie about a psychopath

its a movie about a woman who moves in a new apartment…the building looks old.she becomes friend with her neighbor who falls in love with her and starts stalking her through the walls i think…at some point he puts sleeping pills in her wine and leaves the apartment till she is asleep then he
undress her in underwear…after this i remember a scene where she was running from him and she defended herself with a nailgun

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“The Resident” (2011)

Quotes from the below Wikipedia page of the movie:
“The realization provokes Juliet to fight back against Max, and she quickly gains the upper hand, shooting him multiple times with a nail gun before killing Max by shooting him in the head, before escaping.”
“He has rebuilt her apartment to include secret passageways and a two-way mirror, which he can use to watch her.
“Afterwards, he begins drugging Juliet’s wine so he can be closer to her while she is unconscious.