@Giorgi666
I hope your difficult guest will be gone soon!
RE the cleanliness, although most of your guests don't seem to have a problem with it and 4.5 stars doesn't sound that low, that does seem like your weakest rating and possibly what is stopping you from becoming a Superhost (unless you cancelled a guest in the past year?) as your reviews are generally very good.
I have a lot of books in a couple of the rooms at my place. I find the easiest way to clean these is using an old fashioned feather duster on the books and then a microfibre cloth and furniture spray on the exposed parts of the shelves. If you do this regularly, it becomes a quick and easy task. However, if you haven't done it for ages, you may need to take off all the books to give them and the shelves a proper dusting.
If you have fabric coverings for your sofas etc and they are not removable/washable, they can be kept dust free by using the upholstery attachment on the vacuum cleaner. This will help prolong the life of the covers as, if dust is allowed to accumulate for too long, the dirt becomes permanent. I also spray the upholstery with a fabric freshener.
A lot of people forget about these things and only clean the hard surfaces and floors, but remember that dust is mostly dead skin cells and a lot of people have allergies etc. so you are going to get some guests that freak out if they see much dust in any area.