This Halacha is an excerpt from our Sefer
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May one visit, or live in, the house of a gentile during Pesach?
Although it is seemingly permitted to visit, or even live in the home of a gentile throughout Pesach even though the gentile will have Chametz in the home, nevertheless, it is best to avoid doing so.
 From the letter of the law it is permitted to do so, as although even the Chametz of a gentile must be placed behind a Mechitza lest he come to eat it [Admur 440:5], this is only required in one’s own home, when the gentile is not there. However, when living in a gentile’s home, in presence of the gentile, we do not suspect that one will eat from his Chametz unless one is eating with him the same table. [See Admur 440:3-4] Nonetheless, this is certainly not an ideal situation, and hence one should do all in his power to make other arrangements for Pesach.