I’ll start by saying that there are a lot of STR’s in Seattle currently(6k+), which has been increasing over the last few years if you look at the numbers being listed.

At which point, is having a hot tub increasing your listing's SEO THAT much?

There are different loan types for each strategy and thus different terms and conditions associated with each.

Some savvy investors will buy a multifamily property in rough condition, fix it up, and rent it out so that the end buyer (you) has a turnkey experience.

Adding layers of business could complicate things unnecessarily; items such as taxes and legal fees may increase greatly etc.These other factors would greatly play into what my next move would be.

The shorter the prepayment term has an impact on increasing the rate.4.

Depending on your situation, there are also interest-only loan options that can increase your cashflow.

Or have your handyman report out anything that seems off on the condition of the property.

My understanding just from my own research is that if it's a direct threat to health and safety of others or causes landlord an undue financial burden, like your insurance won't cover the breed and you can't find insurance coverage without substantial cost increase, then you may be able to deny it, but your property management likely knows all this and they apparently said it's legit. 

I'm looking forward to the increased traffic of the season to help out with the over saturation issue.