The decor doesn't need to be expensive, she thrifts a lot of vintage pieces and orders the majority of soft materials and bedding/mattresses from Amazon, but you can feel the difference between a professionally catered home and a less curated space. 

We furnished a 1,050 SF house (dining room table and 4 chairs, sofa, loveseat, armchair, 2 end tables, 2 bedroom sets minus mattresses, and a desk) for $5,800, which was $1,600 less than where we started.

Having nurse friendly amenities is important : blackout curtains, allows pets (many bring pets), good mattresses

Here are a couple other tips:- Describe each room with LONG descriptions with tons of details like mattress type and bedding quality.

You can make this work with an 8' ceiling; you just won't be using a thick mattress. 

You need to create a UNIQUE value proposition, and in the world of STRs, that not only comes from many areas: namely the property's ability to capture attention on the platform and the guest experience from response times to questions or booking confirmations, to comfort of mattress and towels, to enough toilet paper being on site, through to checkout requirements.

Think like a guest: you don't want your socks to turn black while walking through the house, have a crappy mattress with flat pillows, rough sheets, not enough paper towels or toilet paper, bad wifi, etc.  

Usually ordering memory foam mattresses (that come in deliverable boxes) and bed frames.

Just the frame, no mattress.

The basement also has a store room with a mattress in it, and the light is on, and it looks like someone might be using it.