I would do it after you do any other renovation and painting to avoid impacting the new flooring.As far as a ballpark cost, are you doing it yourself or having it installed? 

There is some concern as to whether in the future there will be any new taxes, guidelines, ordinances, etc that could impact the ease & profitability with AirBnb.

CA should give you more appreciation long-term plus your equity pay-down on an annual basis will be huge so the overall impact to your net-worth on a CA property should be similar, if not higher to what you would get out of state, you would just sacrifice on the cash flow front here in CA.

Best impact to NOI is to convert the non-residential space to studios (I dislike managing studios, but they are best development option for NOI increase). 

When sending these violation notices I have still collected rent and that doesn't impact my ability to evict.

However, without a pro forma that accurately estimates all expenses and impacts to income, you do not know your true cash flow (in your case negative in all listed cases).  

I was lucky to have loving parents who taughtme ethics, morals, and the value of Hard work.Your circumstance (luck) has a huge impact on you're probability of success.

Will there be an impact on long-term home value?

See if your local market has a tendency to slow down this time of year or if it is not impacted.  

It showed the impacts of demand growth which cause a change in assets value and construction.