Two really good information packs
a) everything you can think of about the property, how heating/appliances/locks/wifi work and who to call if they don't (probably you with a 24/7 dedicated mobile, but have a fall back too) plus arrangements for bins, AND in this one local information such as nearest doctor, A&E, emergency dentist, pharmacy rotas, nearby supermarkets (and which ones deliver to the address) and their opening hours, market days, other admin
b) 'what to do' Information - local attractions, life-guarded beaches (and parking info), tide table, cycle hire shops, walking trails, nearby sports facilities, clubs which welcome visitors, etc. More the better, check frequently all info is in date
And put both of them somewhere blazingky obvious! Because I was somewhere where they were stuffed in a cupboard and I found them only on the last day when I was checking I hadn't left anything behind.