If you bring cleaning supplies and just wipe down high-contact areas like counters, doorknobs, refrigerator handle, etc. when you arrive, it doesn't really seem any more risky than something like bringing in groceries from the grocery store, which may have been touched by other people, the cashier, etc. Or to be extremely cautious, you could pay for an extra 3 days prior to arriving to make sure nobody has touched anything in that time. If you're gonna be there a full month anyway, what's another 3 days added on to the cost.