Hi @MaryJane8
From a fellow host in Bristol. When you accepted the booking did the guests say why they were coming to Bristol? You can't really say anything about the guy being in all the time as they have booked the space.
however in your shoes if he's not allowed access to the front garden you can remind him on this and that if he's wants to use the hosepipe he must put it away after use. .
i leave my clothes line up during the summer months so there isn't a cover for the guests to worry about.
if they can't park the van on your drive away safely so you can still use it I would ask them to park on the street.
hope it all works out for you.