Let Sleeping Dogs Lie
(do not agitate a potential source of trouble)
You'd better not say anything to the owner of the building about your apartment. If I were you I'd let sleeping dogs lie. The last time you asked him to do some repairs, he raised you rent.
You' telling me not to make trouble if I don't have to, but I'm going to risk making him angry, since I can no longer stand to look at the paint peeling off the walls.