Also would love to know from other members how much they spent on the last project and what is a good contigency to put on the final cost for a first timer.

What is the appropriate level of cleanliness to maintain during project work?

The goal is to achieve and maintain financial freedom.

Remember, turnover is one of your most expensive costs, so try to eliminate downtime and repair costs by doing it right the first time.What are your tricks when it comes to renovating or maintaining rental property bathrooms?

As others have stated, your fit & finish goals should be guided by whether you plan to:1) Rent: tenants don't always take care of a property, so you want to use lower-grade materials and workmanship.2) Flip: higher quality on workmanship and materials is usually required.Regardless, you always want to "Maintain to the Neighborhood".

This is usually the case if past owners did a poor job maintaining, and just hired the cheapest neighborhood handyman to patch everything. 

I’d be willing to pay for them to sign up as I think it would help with on-time rent payment.

STR's, if done right, are viable long term investments meant to cash flow at a reasonable enough level to properly maintain and improve them. 

They will read that if the borrower does this:    Fails to pay tax's,  Fails to maintain the property ( commits waste) , fails to provide insurance  or ALIENATES the title..

Quote from @Grant Francke: For those with using Buildium for property management software, do you use Buildium's public site or do you use a website you have made and maintain?