Rental property expense or capitalize?

I am not really up to date on this, but I will give you a couple suggestions to look into.

This discusses expensing vs depreciating

https://www.nolo.com/legal-encyclopedia/repairs-vs-improvements-how-tax-deductions-differ-landlords.html

In particular it talks about small cost improvements that one might think need to be depreciated saying:

The safe harbor for small taxpayers (SHST) allows landlords to currently deduct all annual expenses for repairs, maintenance, improvements, and other costs for a rental building. However, the SHST may only be used for rental buildings that cost $1 million or less. And the annual SHST deduction is limited to the lesser of $10,000 or 2% of the unadjusted basis of the building. This limit is determined on a building by building basis—for example, if you own three rental homes, you apply the limit to each home separately.

The IRS says has this page including instructions on how to make the election 

https://www.irs.gov/businesses/small-businesses-self-employed/tangible-property-final-regulations#SafeHarborElectionforSmallTaxpayers

If you don't find a Schedule E category that makes sense, you can always use "other" and include a description.