When we travel and stay at a hotel or a friend's home, we need to be mindful of the energy that is constantly in flux. This meaning, we are giving energy and receiving it, knowing and unknowingly.
This could also be referred to as "predecessor energy," meaning energy left behind from those who previously occupied that space physically and spiritually. When you travel, its suggested to either wear a protective emblem of your choosing and/or bring along a small traveling altar that could be placed inside the room of where you stay.
I did this when traveling throughout North Carolina, as I stayed for a week providing Feng Shui workshops. That is a lot of time to absorb various energies. My small traveling altar simply helped to clear the room of it's energy, allowing me to claim short term space and be protected, while also leaving behind blessings.
Select items that you feel protected by, that make you feel good. I follow more of the Buddhist altar presentation. Small Statue of Buddha, Fu-dogs for protection, Flute for blessings, crystals and fruit.
Find what works for you.