There's my sweet DaVinci!
Jen, they are not alone, there are 4 of them together in posh surroundings with a caretaker who loves them.
It sounds a whole lot better than being in a metal cage in the shelter or out on the streets somewhere.
Do you have a bed up there on the 3rd floor?
Maybe some weekend you can have a slumber party up there with those kitties while Charlie spends time with the other cats downstairs.
Or you can make it into a Pet Talk guestroom where cat loving friends from Pet Talk can stay and have 4 kitties sleep on the bed with them.
Or you can leave the door open and let them mingle with the rest of the furkids and become permanent residents. ( You will just need to update your signature photos for us.)

Give DaVinci some extra hugs and kisses from me.