Please note the information provided below is a layman's definition designed to provide a basic understanding for the general audience.

A major part of the success or failure of an STR investment is the design, furnishing and management plan.

They claim to market on dozens of online channels, and they seem to know the right amenities to feature, have great design, services, experiences etc.

Just go on fiverr and hire an interior designer in Romania for $10https://www.biggerpockets.com/forums/530-short-term-and-vaca...

Most take near a year in southern Ca, but you hear of exceptions in both directions on that timeline.What some developers are doing here is leveraging the affordability issue and getting permission to build additional ADUs by designating some as affordable or semi affordable units.  

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BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

I've looked at every model of every new build of every company I can find and there's always problem with design, returns, etc.

Do they value nicer finishes and design or is that additional cost lost on the typical tenant in that pocket?

Then you'll need to find land, acquire it, find a spec home buyer and set up meetings to design plans or buy a set online with mods.