you will have 3 months to change your licence over so if you have dates ect it would be good to book in for your safety test before you come down
you do not have to tell the landlord anything and I wouldn't, you will have to have the firearms safe bolted to the floor or wall but if you fix damage before you leave there is no problem that I can see,
I dont know of any commercial gun storage in that area but if you want to pursue that I would be asking the local gun shops
probably be a good thing to find out who the local dfo is and contact them for some advise
“If you do not read the newspapers you are uninformed. If you do read the newspapers you are misinformed”. Mark Twain