Make sure you invest in an area that will allow them...many Northern Michigan communities are enacting laws to suppress or not allow AirBnB's or other "homeaway" type rentals. 

There is an option before checking out the second time where you can suppress your list against another, as long as the old list was purchased within the last 6 months.As for removing duplicates, I would recommend: yes.

Storm ponds, storm sewer, property water flow, fire hydrants, utility access, sidewalks, soil compaction, driveway access, landscaping, facade requirements, fire suppression, fire walls or building separation distance, fencing, setbacks, required parking, outside lighting, epa, Corp engineers, grading/elevation, etc.  

Amazon sells panels that suppress sound.

Most people outsource the cleaning to the same company that is in charge if managing the fire suppression systems for the kitchen/building.  

You should study his ads but also keep in mind that markets are very rapidly saturated which suppresses rental fees dramatically.By the way, I'm noticing a LOT more business travelers booking my urban STR.

Onsite fire suppression (i.e. private fire hydrants) need to be supplied and a private fire service maintained.

I don't know that you would want a water based fire suppression system in a kitchen.

With the aggressive fire suppression over the last 100 years the west is seeing dramatically LESS acres burned every year than the historical average.

I have a client on the coast that has identified a vacation rental eligible property, a 3/2 1700SF coastal home with garage and the county requires a sprinkler system for fire suppression as it is considered a ‘commercial’ type usage.