Who is the Ishah?
Rashi #1: A Zonah.
Rashi #2: An Apikoros.
Why does she come to greet him?
Malbim: Just like he intended to go to her house, she goes out to greet him.
What is "Shis Zonah"?
Rashi: The Ervah of a Zonah. This is like "Shesoseihem" (Shmuel II, 10:4). Malbim - her Ervah is sunk in Zenus via her body's nature.
What is "Netzuras Lev"?
Rashi: This is like "k'Ir Netzurah" (Yeshayah 1:8) - it is surrounded by a siege. So this one's heart is surrounded with the evil of Zimah.
Malbim: She has no power that rules over her desire. Her heart, the power that rules, is constantly surrounded by thoughts of desire for sin - "Metzudim va'Charamim Libah" (Koheles 7:26).