In 4 years, I've found one in my house, a very squashed dead one. It was near the front door so it might have been brought in on the bottom of someone's shoe.
Does make one pay attention, doesn't it! Just take care....check your shoes before you put them on, check the bed before getting in. From what I've read, they seem to show up around new construction areas here. Not sure if you're in a newer home or not.
Have fun while you're here, don't worry too much about the bugs. If you're really uncomfortable, let the homeowner know. They can notify their pest control company and have them out to spray.
Glad you rescued the snake....