OP here. The advice I got that I'm now religious about: on move-IN day, photograph and video everything with a timestamp — every mark, scuff and appliance — and email it to the landlord so there's a dated record. Your move-out defence is built on move-in day.
A friend just lost most of a hefty deposit over 'damage' that was there when they moved in and couldn't prove otherwise. It's made me paranoid about my own move-in. For those who've been through a move-out here — what should I be photographing, dating, and getting in writing now, so I'm not fighting for my money back later?