I support the change.As a host and regular guest it is a constant source of frustration when me or my guests can't compare apples to apples on what a place costs. 

It's usually a combination of the two.I'd be curious to hear how far below market they were and how much money you lost.For those looking to run like a business and build wealth, turnover is a natural, healthy indication you're doing things right.

Can anyone advise the cost of removing such duct (about 2-3 meter long), together with the removal of the hooks to support the duct in the ceiling, as well as to close off the vent at the cut off place?

If you need immense training and want to focus on all sorts of deals, go with a big name like Douglas Elliman or Corcoran or Compass.If you need some training and support, but are comfortable running your own shop - try Keller WilliamsIf you want the largest cut with the least support, go with ExP - you have to think of this is starting your own business vs. getting a job though.I personally am licensed with ExP

So find a home online that is where you want it to be, and has enough rooms / land to support some income from roomates. 

I had one advise me on a lower rent than what I knew the market would support.

I think the wait and see is the way to go since there isn't much support for doing otherwise.

Being that they are investors and want you to make your payment, they understand that the cashflow has to support the payment.

Is there a source where you can find support (Cleaners/co-hosts etc) for STR's. 

I've (and my wife, who doesn't have much to do with it but is supportive of it) have been investing in real estate for about 3.5 years.