Handling pesky maintenance requests

[Jeremy Fields]

I have a tenant who pays on time, keeps her place clean, and plans to rent for several years. However, she asks for the most annoying things to be fixed and it's taking more time than I want to spend. 

Examples: mailbox door wont always stay shut, crickets and other insects (basement apartment), door to furnace doesnt stay shut, screen door wont lock, etc.

I have a hard time saying no to her requests, because in reality I guess these things should actually be handled, but it's stuff most of tenants would handle themselves or just shrug it off.

Any suggestions on how to combat something like this?