@Willie56 Aside from creating even more listings, some of which contain two rooms, about all you can do is mention in your listing description that you actually have 7 bedrooms for rent and if guests are interested in booking more than one, to just inquire. Then you could send them a special offer so it was less expensive for the second room.
Of course, this doesn't reallly help if a guest has filtered for 4 guests, as your room listings won't come up if they are only suitable for 2 guests.
As far as the reviews, all your listings will have a line by the review area which says "This host has xx # of reviews for other properties" and if the guest clicks on that, they will see all your reviews.