http://revach.net/article.php?id=4294

Section: Halacha   Category: Tefila
Shela HaKadosh: Tough Decisions About Where To Daven
During Makas Barad, Moshe Rabbeinu told Paroh (VaEirah 9:29), "K'Tzeisi Es Ha'Ir Efros Es Kappai El Hashem", when I leave the city I will spread my hands in tefila to Hashem.  Rashi says that Moshe Rabbeinu would not daven in the capital city because is was full of Avoda Zara.

The Shela HaKadosh says that we learn from Moshe Rabbeinu that you may not daven in a place that has Avodah Zara or pigs or other dirt.  Therefore he says when a person is on the road and will be staying in a hotel where this could be an issue, it is better to daven on the road in a clean place rather even sitting down, rather than wait until to you arrive at your hotel where this could be an issue.

Where this comes into play today is a question that needs research, but what is clear is that anything that is a Shemetz Avodah Zara or Tinofes is assur to daven next to, whether in a hotel room or even in our own homes.   It is better to daven in a place that is less conducive to davening than to daven in a place that is assur, even if we are more comfortable with it.

Important Note: We bring this tshuvah as a starting point for discussion and not to convey any halacha.  We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. One should learn the tshuva to verify the accuracy of our interpretation.  Please understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.