I just get mine up to average market condition which means the least amount of improvement needed besides expected necessity.

While AirBNB is certainly imperfect about how they handle resolutions, I think there are some valuable insights here about the necessity of documentation.Putting myself in AirBNB's shoes, photos and invoices are absolutely critical to resolving disputes and damage/expense claims - otherwise, they would be at the mercy of people who wanted to abuse the system and make frivolous or false claims.  

Whether you build a site yourself or get one from us, an online web presence is becoming more and more of a necessity.

My place is almost 100 years old so there was plenty in the inspection that wasn’t a necessity to have repaired.

It certainly is a plus, but today it definitely not a necessity.

They don't cook, go out to shop or engage in personal contact with others so there is very little in the way of necessities.

Good evening BP, I was writing up the agreement for my future Contract Assignments and came across the possible necessity of an escrow agent.

Necessity is the mother of invention, I wish I had done this sooner. 

Entrepreneurship is the coming thing, by necessity.

@Andy Bettag Between the two, I'd say it's more important to find a tax preparer in the state where you live, though this is less of a necessity in this day and age.