Usually just hope they stay away from me. One house had hoarders living in it and their two foot crawl had an infestation of common house spiders:
Everywhere I looked I saw one and they scurried around in the open too instead of staying in their webs like normal spiders. Thats what I really hated. Those spiders infested because of the moisture problem the people had which also caused the ground to be covered in some kind of white web looking mold and the occasional mushroom patch. I felt like I was in some kind of weird alien movie.
Then another house we did a change out on, the homeowner wanted a lead put back up that kept falling down at the very back of his crawl where you had to crawl flat. The only problem was the black widows everywhere