@Id0 I would just put wording in the body of your listing description about both of those things. Put the Covid precautions in your House rules as well, the thing is that many guests just don't read that far. So mention it in both places.
There are many hosts who provide differently for long term stays than short term- they may just provide a starter amount of essentials like toilet paper, soap, etc, enough for a few days until the guest has a chance to go shopping, and expect long term guests to buy their own after that.
So you can still check off breakfast in the amenities, but put in your listing description "Long term stays- Please Note: Breakfast is not provided for bookings over xx days" along with whatever else you might not want to provide for long term.