@Megan5 I would not for a milli-second consider installing a camera inside the hosted space! I could not think of a more invasive way to intrude on a guests privacy (bar sitting in an armchair in the corner)!
Megan, there has to be a certain element of trust attached to hosting! Heavens above, I have a full on library, and some quite highly priced artwork in my studio plus a lot of personal things but, it adds enormously to the homely comfortable ambience of the space.
I even have hanging on one of the walls the one and only picture of my mother, taken in 1932...she was a beautiful woman but never thought it of herself and systematically destroyed every other photo she found! It's a beautiful personal touch, it makes guests feel they really are welcome...and, after all, who is going to steal a photo for goodness sake!!@!
Somebody once said to me on looking through the cottage..."Don't put anything in there that you aren't prepared to loose"! But, hell, you can't treat people like that.....and I have only ever lost one thing.... a couple of books a 'Christian' couple, here for some new church dedication in the area borrowed, and didn't return!
There are remedies with Airbnb if theft happens and, if you are concerned about theft set up a suitable stratergy with Airbnb. In a shared facility it's always a good idea to have a couple of locked cupboards that you put things into that are not for the guests use....It can be a cupboard in the kitchen, or the Linen press or similar. At least this sets the ground rules without making a big deal of it.
Megan...camera....definitely not!!!! Cheers....Rob