The site advertises prices/week.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

One of the lease for a rental is about to expire and would like to change from single family to rent by the room and try, to market for regular leasing we normally go to Zillow and advertise for free, but for rent by the room not sure which of all the sites out there will be the best option(s), some of them are for free, majority pay a monthly or anual subscription ($99 to $200).Do you have any guidance on which to select?

Santarelli as an absolute industry expert (podcast, websites, press, social media advertisement) cause investors to have a false sense of security.

Advertising an illegal, non-conforming basement for rent, whether publicly or privately, out right violates local laws. 

I would just point out that you must make clear you are selling the interest to purchase, cannot advertise the underlying real estate (as that would require a license).

A mortgage broker is one who is in the business of dealing in mortgages or notes, it is their primary source of income, they advertise and seek out note purchases and sales, there is a thin line between being a broker or in the mortgage business and being a personal investor. 

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Advertising (photos and listings.) turn over costs, snow removal, and those kind of things.

It's only 110V but would be nice on the property advertisement for potential tenants.