Is it fairly priced for the size, location, quality, and other factors?

That should really be the deciding factor...is it necessary and a large enough project to include the permit process?

The major factor to standing out in any market is design.

Your accountant should be able to factor that into your total cost. 

Location and amenities are the two most important factors that bring potential renters to an STR. 

Can I purchase the rods and charge back to tenant as missing/damaged window treatments when originals were blinds?

To do this, they have a team consisting of an inspector, a makelaar, and renovation professionals.However, as Ken M. mentioned, having someone trustworthy there to manage everything would also be a key factor.

That’s a huge advantage.Totally agree on property management being a make-or-break factor.

If you're considering house hacking a multi family property, some lenders might be able to factor in potential rental income to help you qualify.

(Of course, there is a factor that higher rating will increase my booking but that is not just coming from adding one or two amenities) Besides item 5 and 6, I am not sure how much other items will attract more guests to my business.