@Debbie1353 The best course of action here is to simply communicate with the host! Ask some questions and express your concerns. Maybe ask the questions first, and possibly you won't have concerns.
The host is obviously conscientious by virtue of the fact that they informed you. It may be something very minor, and they are just being good hosts. Maybe it's somebody outside for one hour in the afternoon? You won't know until you ask!
I understand it's not ideal to receive such a message, but a few questions might alleviate your worries. Communication is the key in so many situations.
About a month ago I "warned" some incoming guests that the prior guests had encountered several bees in my cabin. This was a first, and I knew there wasn't a hive or nest anywhere, but in an overabundance of caution, I went into great detail about the bee encounter because I was being a conscientious host. In the end, no bees. Did I cause the guests some concern? Maybe, but I think I did the right thing.
Good luck. Hope it works out.