However, the appraiser says that the stairs are of safety concern, and I need to be rebuild to code.

The HUD inspection guidelines are built around safety & health. 

I’ve been following BP for years and have some minors experience with one property.Long story short, my partner and I are on the same page to prioritize this.

You could consider offering to have the shower inspected by a licensed professional to provide a written report confirming its safety and functionality to address your tenant's concerns.If your tenant continues to refuse to pay rent, you may have grounds to evict them for non-payment of rent.

**Electrical Safety Hazards: Exposed Wiring and Issues with GFCI Outlets** - Exposed wiring in easily accessible areas and GFCI outlets in the kitchen that wouldn't reset pose significant electrical safety hazards.4.

You're prioritizing a 3% rate and being an "investor" over family planning-- this is what's wrong with society. 

Then those activities you listed become the safety buffer that you can lose in an argument with the IRS and still have 750 hrs.Also, there's a controversial issue about an election to aggregate.

Do your best to mitigate issue before they crop up and annoy residents.Maybe create a free service, for those that are not using your management services, to come and review their STRs for safety, procedures for help etc.

What are the best ways to prepare for the Law & Safety and General B license?

Certainly, consider the feelings, but prioritize the facts.