You're likely better off taking a passive role on an expert's platform.

Good morning, is there anyone that has any experience in either renting or buying an apartment in a large metropolitan area and using an AirB&B type platform and renting it out by the week?

My perspective will be without the agency side as we currently do not have those programs on our platform for a number of reasons.Thoughts:When you are looking at properties with a purchase price (PP) under $50k, you will have challenges finding financing. 

I have a great contract on a piece of land in a high traffic area, is there any suggestion were I can advertise this at other than the obvious big platforms?

FCI Exchange "Site Closing Notice"FCI Exchange has had a wonderful 8 year run and we wish to thank all of our platform users.

Is there a website with a similar platform to Airbnb, or a hotel that would allow the company to have a "booking experience" for their use of my property?

Amazon, however, offers buyers more protection by going through their platform along with fast shipping.

However, you can do it appropriately if it's a company or marketing platform where it would be accepted that someone other than the "CEO" would be creating the content. 

I left school, started a crypto-currency based trading app and failed. the unstable nature behind crypto's was too uncertain to succeed as an investment platform.

You can diversify across property types and locations that you like. and crowd street is one of many platforms so just choose the group you feel most comfortable with.