@Kayla26 you've covered a lot of ground...
-a host entering without notice, not ok
-a host entering with notice and with reason, this is ok and would be true in any short or long-term lease situation. You aren't required to change your plans or make adjustments, they're just letting you know that they'll be there. In my opinion, they are the owner, you're the guest and this falls into an area where tenant's rights don't allow you to prohibit their access. Maybe if you're truthful with all the changes you've made you could convice the host that their prospective guest won't like what they'll see and get them to put it off. If you were renting my house I'd expect you to kennel the dogs, open the door and say hello and then put on your headphones and keep working.
-not all rentals go thru ABB so an in-person showing for a 6 month rental is not out of the ordinary. Seems like there's plenty of ABB places you've stayed at that you might wish you'd toured first.
- however, if they're on-property then they'll realize that you've moved a whole bunch of things and are using their space in ways they didn't intend (mattresses on floor...) perhaps this will be ok, perhaps it won't.
- will their unhappy review matter in the future? maybe/maybe not. Your complaining reviews might make me wary to host you already so this may not make much difference
even with you renting the place, life must go on. Pest control may come, maintenance may be needed, a new tenant may need to have a visit. You had a poor host before, that doesn't mean this host is being unreasonable. (IMO)