Think yourself lucky…couple of years ago we lived in a rented flat. Heard scratching in the ceiling a few times over several weeks, eventually worked out that a rat was getting out of the sewer via a broken drain cover, into the house through vent brick that had been enlarged to get an aerial cable through, then up behind the kitchen units alongside the waste pipe, into a partition wall and up through the insulation, and into a boxed in area over the kitchen wall units 🙁 As it moved around bits of chewed up newspaper would drop down alongside the cooker extractor 😯
My brothers hamster had a close escape a while back, it was loose in the bathroom whilst its cage was being given a good clean in the bath. One of our cats got onto the window ledge and jumped in through the window, grabbed the hamster and tried to escape back outside. Luckily someone managed to give the cat a good swipe before it got out and it dropped the hamster in shock!
Over the years it also turned up with a goldfish and next doors guinea pig…how the hell it got that through the cat flap I dont know!