What is the correct noun for "apartment viewing"?
I believe that the phrase used by realtors most often, at least in the United States, is, "The broker has a showing." We've been through several property sales and have one in progress right now. Our realtor often says to us, "We have a showing today."
I've noticed, though, that there's a problem with finding additional verbs to accompany the word "showing" when it's used as a noun. "Hold a showing" or "Do a showing" both sound strange. "I'm attending a showing," however, sounds fine.