Tip 1: Be super nice
If your landlord is difficult, go out of your way to be nice and friendly. It’s really disarming to a crabby person to have someone act extra nice towards them; after all, you catch more flies with honey than with vinegar.
Tip 2: Write everything down
Try to communicate mostly via email or SMS; that way you’ll have a written record of everything that was said and you will have a full log of all the details, should any conflict arise.
Tip 3: Pay your rent on time
Keep your side clean by always paying your rent in full and on time.
Tip 4: Handle minor repairs yourself
If your landlord is already complaining a lot, try not to contact him/her for every little thing. Save receipts for all your costs so you can turn them over with the keys when you leave. This could help when you’re working against a landlord who wants to nitpick about the condition of the house or flat after you leave.